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IntegrationQuestion and Answers: Page 300

Question Number 34674 Answers: 0 Comments: 0

find ∫_0 ^π ((x sinx)/(1+cos^2 x)) dx

$${find}\:\:\:\int_{\mathrm{0}} ^{\pi} \:\:\:\frac{{x}\:{sinx}}{\mathrm{1}+{cos}^{\mathrm{2}} {x}}\:{dx} \\ $$

Question Number 34662 Answers: 0 Comments: 0

calculate I(a) =∫_(1/a) ^a ((ln(x))/(1+x^2 )) dx with a>0 2) calculate ∫_0 ^(+∞) ((ln(x))/(1+x^2 )) dx .

$${calculate}\:{I}\left({a}\right)\:\:=\int_{\frac{\mathrm{1}}{{a}}} ^{{a}} \:\:\frac{{ln}\left({x}\right)}{\mathrm{1}+{x}^{\mathrm{2}} }\:{dx}\:\:{with}\:{a}>\mathrm{0} \\ $$$$\left.\mathrm{2}\right)\:{calculate}\:\:\int_{\mathrm{0}} ^{+\infty} \:\:\frac{{ln}\left({x}\right)}{\mathrm{1}+{x}^{\mathrm{2}} }\:{dx}\:. \\ $$

Question Number 34661 Answers: 0 Comments: 0

let f(x)= ∫_0 ^1 (e^(−(1+t^2 )x) /(1+t^2 )) dt find a simple form of f(x)

$${let}\:{f}\left({x}\right)=\:\int_{\mathrm{0}} ^{\mathrm{1}} \:\:\frac{{e}^{−\left(\mathrm{1}+{t}^{\mathrm{2}} \right){x}} }{\mathrm{1}+{t}^{\mathrm{2}} }\:{dt}\:{find}\:{a}\:{simple}\:{form}\:{of} \\ $$$${f}\left({x}\right) \\ $$

Question Number 34635 Answers: 2 Comments: 4

calculate A(α) = ∫_0 ^1 ln(1+αix)dx 2) calculate ∫_0 ^1 ln(1+ix) dx (i^2 =−1)

$${calculate}\:{A}\left(\alpha\right)\:\:=\:\int_{\mathrm{0}} ^{\mathrm{1}} \:{ln}\left(\mathrm{1}+\alpha{ix}\right){dx} \\ $$$$\left.\mathrm{2}\right)\:{calculate}\:\int_{\mathrm{0}} ^{\mathrm{1}} \:{ln}\left(\mathrm{1}+{ix}\right)\:{dx}\:\:\:\:\left({i}^{\mathrm{2}} \:=−\mathrm{1}\right) \\ $$

Question Number 34633 Answers: 0 Comments: 0

let f(α) = ∫_(−∞) ^(+∞) ((arctan(1+αxi))/(1+x^2 ))dx find f(α) .

$${let}\:{f}\left(\alpha\right)\:=\:\int_{−\infty} ^{+\infty} \:\:\frac{{arctan}\left(\mathrm{1}+\alpha{xi}\right)}{\mathrm{1}+{x}^{\mathrm{2}} }{dx} \\ $$$${find}\:{f}\left(\alpha\right)\:. \\ $$

Question Number 34593 Answers: 0 Comments: 0

1) calculate ∫_(−∞) ^(+∞) ((cos(αx^n ))/(x^2 +x +1)) dx with n integr natural 2) find the value of ∫_(−∞) ^∞ ((cos( α x^(2n) ))/(x^2 +x +1))dx 3) calculate ∫_(−∞) ^(+∞) ((cos(π x^3 ))/(x^2 +x +1)) dx

$$\left.\mathrm{1}\right)\:{calculate}\:\:\int_{−\infty} ^{+\infty} \:\:\:\frac{{cos}\left(\alpha{x}^{{n}} \right)}{{x}^{\mathrm{2}} \:+{x}\:+\mathrm{1}}\:{dx}\:\:{with}\:{n}\:{integr} \\ $$$${natural} \\ $$$$\left.\mathrm{2}\right)\:{find}\:{the}\:{value}\:{of}\:\:\:\int_{−\infty} ^{\infty} \:\:\:\:\frac{{cos}\left(\:\alpha\:{x}^{\mathrm{2}{n}} \right)}{{x}^{\mathrm{2}} \:+{x}\:+\mathrm{1}}{dx} \\ $$$$\left.\mathrm{3}\right)\:{calculate}\:\:\int_{−\infty} ^{+\infty} \:\:\:\:\frac{{cos}\left(\pi\:{x}^{\mathrm{3}} \right)}{{x}^{\mathrm{2}} \:+{x}\:+\mathrm{1}}\:{dx} \\ $$

Question Number 34562 Answers: 1 Comments: 1

find the value of ∫_0 ^1 ((arctanx)/((1+x^2 )^2 )) dx

$${find}\:{the}\:{value}\:{of}\:\:\int_{\mathrm{0}} ^{\mathrm{1}} \:\:\frac{{arctanx}}{\left(\mathrm{1}+{x}^{\mathrm{2}} \right)^{\mathrm{2}} }\:{dx} \\ $$

Question Number 34561 Answers: 0 Comments: 1

find the value of ∫_0 ^(+∞) ((arctan(x))/((1+x^2 )^2 )) dx

$${find}\:{the}\:{value}\:\:{of}\:\:\int_{\mathrm{0}} ^{+\infty} \:\:\frac{{arctan}\left({x}\right)}{\left(\mathrm{1}+{x}^{\mathrm{2}} \right)^{\mathrm{2}} }\:{dx} \\ $$

Question Number 34985 Answers: 1 Comments: 0

Question Number 34421 Answers: 0 Comments: 1

let A = ∫_(−∞) ^(+∞) (dx/(x^2 −j)) with j=e^(i((2π)/3)) extract ReA and Im(A) and calculste its values.

$${let}\:{A}\:\:=\:\int_{−\infty} ^{+\infty} \:\:\:\:\frac{{dx}}{{x}^{\mathrm{2}} \:−{j}}\:\:\:\:{with}\:{j}={e}^{{i}\frac{\mathrm{2}\pi}{\mathrm{3}}} \\ $$$${extract}\:\:{ReA}\:{and}\:{Im}\left({A}\right)\:{and}\:{calculste}\:{its}\:{values}. \\ $$

Question Number 34320 Answers: 0 Comments: 2

calculate ∫_(−∞) ^(+∞) (dx/(x^2 +1 −i))

$${calculate}\:\:\:\int_{−\infty} ^{+\infty} \:\:\:\:\:\frac{{dx}}{{x}^{\mathrm{2}} \:+\mathrm{1}\:−{i}} \\ $$

Question Number 34316 Answers: 0 Comments: 0

find a eajivalent of u_n = ∫_0 ^∞ e^(−(t/n)) arcctant dt .

$${find}\:{a}\:{eajivalent}\:{of} \\ $$$${u}_{{n}} =\:\int_{\mathrm{0}} ^{\infty} \:\:\:\:\:{e}^{−\frac{{t}}{{n}}} \:\:\:{arcctant}\:{dt}\:. \\ $$

Question Number 34315 Answers: 0 Comments: 2

1) find F(x)= ∫_0 ^(+∞) ((e^(−at) −e^(−bt) )/t)sin(xt)dt with a>0 ,b>0 .

$$\left.\mathrm{1}\right)\:{find}\:\:{F}\left({x}\right)=\:\int_{\mathrm{0}} ^{+\infty} \:\:\frac{{e}^{−{at}} \:−{e}^{−{bt}} }{{t}}{sin}\left({xt}\right){dt} \\ $$$${with}\:{a}>\mathrm{0}\:,{b}>\mathrm{0}\:. \\ $$

Question Number 34314 Answers: 0 Comments: 1

let f(x)= ∫_0 ^(+∞) ((1−cos(xt))/t^2 ) e^(−t) dt calculate f(x) .

$${let}\:{f}\left({x}\right)=\:\int_{\mathrm{0}} ^{+\infty} \:\:\frac{\mathrm{1}−{cos}\left({xt}\right)}{{t}^{\mathrm{2}} }\:{e}^{−{t}} {dt}\: \\ $$$${calculate}\:{f}\left({x}\right)\:. \\ $$

Question Number 34312 Answers: 0 Comments: 1

calculate I = ∫∫_D x^3 dxdy on the domain D ={(x,y)∈R^2 /1≤x≤2 , x^2 −y^2 −1≥0}

$${calculate}\:{I}\:\:=\:\int\int_{{D}} {x}^{\mathrm{3}} {dxdy}\:\:\:{on}\:{the}\:{domain} \\ $$$${D}\:=\left\{\left({x},{y}\right)\in{R}^{\mathrm{2}} /\mathrm{1}\leqslant{x}\leqslant\mathrm{2}\:,\:{x}^{\mathrm{2}} −{y}^{\mathrm{2}} −\mathrm{1}\geqslant\mathrm{0}\right\} \\ $$

Question Number 34308 Answers: 0 Comments: 0

let I = ∫_0 ^(+∞) (((1+x)^(−(1/4)) −(1+x)^(−(3/4)) )/x)dx prove that I isconvergent and find its value .

$${let}\:\:{I}\:=\:\int_{\mathrm{0}} ^{+\infty} \:\:\frac{\left(\mathrm{1}+{x}\right)^{−\frac{\mathrm{1}}{\mathrm{4}}} \:\:−\left(\mathrm{1}+{x}\right)^{−\frac{\mathrm{3}}{\mathrm{4}}} }{{x}}{dx} \\ $$$${prove}\:{that}\:{I}\:{isconvergent}\:{and}\:{find}\:{its}\:{value}\:. \\ $$

Question Number 34298 Answers: 0 Comments: 2

let A_ = ∫_0 ^∞ e^(−x) cos[x]dx and B = ∫_0 ^∞ e^(−[x]) cosxdx calculate A−B .

$${let}\:{A}_{\:} =\:\int_{\mathrm{0}} ^{\infty} \:{e}^{−{x}} {cos}\left[{x}\right]{dx}\:\:{and}\:{B}\:=\:\int_{\mathrm{0}} ^{\infty} \:{e}^{−\left[{x}\right]} \:{cosxdx} \\ $$$${calculate}\:{A}−{B}\:\:. \\ $$

Question Number 34297 Answers: 1 Comments: 1

find ∫_(−∞) ^(+∞) e^(−z t^2 ) dt with z=r e^(iθ) ∈ C .

$${find}\:\:\int_{−\infty} ^{+\infty} \:\:{e}^{−{z}\:{t}^{\mathrm{2}} } {dt}\:\:\:{with}\:{z}={r}\:{e}^{{i}\theta} \:\:\in\:{C}\:. \\ $$

Question Number 34296 Answers: 0 Comments: 3

find ∫_(−∞) ^(+∞) e^(−jx^2 ) with j =e^(i((2π)/3))

$${find}\:\:\int_{−\infty} ^{+\infty} \:\:{e}^{−{jx}^{\mathrm{2}} } \:\:\:\:{with}\:\:{j}\:={e}^{{i}\frac{\mathrm{2}\pi}{\mathrm{3}}} \\ $$

Question Number 34295 Answers: 0 Comments: 0

find ∫_0 ^∞ e^(−n[x]) cos(x)dx with n>0

$${find}\:\:\int_{\mathrm{0}} ^{\infty} \:{e}^{−{n}\left[{x}\right]} \:{cos}\left({x}\right){dx}\:\:\:{with}\:{n}>\mathrm{0}\: \\ $$

Question Number 34294 Answers: 0 Comments: 0

find ∫_0 ^∞ e^(−nx) ∣sinx∣dx with n>0

$${find}\:\int_{\mathrm{0}} ^{\infty} \:{e}^{−{nx}} \mid{sinx}\mid{dx}\:\:{with}\:{n}>\mathrm{0} \\ $$

Question Number 34293 Answers: 0 Comments: 0

calculate ∫∫_D x^2 y dxdy? with D = {(x,y)∈ R^2 / 0≤y≤1−x^2 ,∣x+y +3∣ ≤5}

$${calculate}\:\int\int_{{D}} \:\:{x}^{\mathrm{2}} {y}\:{dxdy}?\:\:{with} \\ $$$${D}\:=\:\left\{\left({x},{y}\right)\in\:{R}^{\mathrm{2}} \:/\:\mathrm{0}\leqslant{y}\leqslant\mathrm{1}−{x}^{\mathrm{2}} \:,\mid{x}+{y}\:+\mathrm{3}\mid\:\leqslant\mathrm{5}\right\} \\ $$

Question Number 34292 Answers: 0 Comments: 1

calculate ∫∫_w (x+y)e^(x−y) dxdy with w={(x,y)∈R^2 / ∣x∣ ≤1 and ∣y+1∣≤3 }

$${calculate}\:\int\int_{{w}} \:\left({x}+{y}\right){e}^{{x}−{y}} {dxdy}\:{with} \\ $$$${w}=\left\{\left({x},{y}\right)\in{R}^{\mathrm{2}} \:/\:\mid{x}\mid\:\leqslant\mathrm{1}\:\:{and}\:\mid{y}+\mathrm{1}\mid\leqslant\mathrm{3}\:\right\} \\ $$

Question Number 34291 Answers: 0 Comments: 0

let B(x,y) = ∫_0 ^1 u^(x−1) (1−u)^(y−1) du and Γ(x)= ∫_0 ^∞ t^(x−1) e^(−t) dt 1) prove that Γ(x) = 2∫_0 ^∞ u^(2x−1) e^(−u^2 ) du 2)give Γ(x)Γ(y) at form of double integrale 3)prove that B(x,y) =((Γ(x)Γ(y))/(Γ(x+y))) 4) calculate B(m,n) for m and n integr naturals

$${let}\:{B}\left({x},{y}\right)\:=\:\int_{\mathrm{0}} ^{\mathrm{1}} {u}^{{x}−\mathrm{1}} \left(\mathrm{1}−{u}\right)^{{y}−\mathrm{1}} \:{du}\:\:{and} \\ $$$$\Gamma\left({x}\right)=\:\int_{\mathrm{0}} ^{\infty} \:{t}^{{x}−\mathrm{1}} \:{e}^{−{t}} {dt} \\ $$$$\left.\mathrm{1}\right)\:{prove}\:{that}\:\Gamma\left({x}\right)\:=\:\mathrm{2}\int_{\mathrm{0}} ^{\infty} \:{u}^{\mathrm{2}{x}−\mathrm{1}} \:{e}^{−{u}^{\mathrm{2}} } {du} \\ $$$$\left.\mathrm{2}\right){give}\:\Gamma\left({x}\right)\Gamma\left({y}\right)\:{at}\:{form}\:{of}\:{double}\:{integrale} \\ $$$$\left.\mathrm{3}\right){prove}\:{that}\:{B}\left({x},{y}\right)\:=\frac{\Gamma\left({x}\right)\Gamma\left({y}\right)}{\Gamma\left({x}+{y}\right)} \\ $$$$\left.\mathrm{4}\right)\:{calculate}\:{B}\left({m},{n}\right)\:{for}\:{m}\:{and}\:{n}\:{integr}\:{naturals} \\ $$

Question Number 34290 Answers: 0 Comments: 0

calculate ∫∫_D ((dxdy)/((1+x+y)^2 )) D ={(x,y)∈ R^2 / 1≤x+y≤ 2}

$${calculate}\:\int\int_{{D}} \:\:\:\:\:\:\:\frac{{dxdy}}{\left(\mathrm{1}+{x}+{y}\right)^{\mathrm{2}} } \\ $$$${D}\:=\left\{\left({x},{y}\right)\in\:{R}^{\mathrm{2}} \:/\:\:\mathrm{1}\leqslant{x}+{y}\leqslant\:\mathrm{2}\right\}\: \\ $$

Question Number 34289 Answers: 0 Comments: 1

calculate ∫∫_w (xy −2)dxdy with w = {(x,y)∈R^2 / x≥0 and 1≤y≤2−x }

$$\:{calculate}\:\int\int_{{w}} \:\:\left({xy}\:−\mathrm{2}\right){dxdy}\:\:{with}\: \\ $$$${w}\:=\:\left\{\left({x},{y}\right)\in{R}^{\mathrm{2}} \:/\:\:{x}\geqslant\mathrm{0}\:{and}\:\:\mathrm{1}\leqslant{y}\leqslant\mathrm{2}−{x}\:\right\} \\ $$

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