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Question Number 60728 Answers: 0 Comments: 0

calculate ∫_1 ^(+∞) ((ln(lnx))/(x^2 −x +1))dx

$${calculate}\:\int_{\mathrm{1}} ^{+\infty} \:\:\frac{{ln}\left({lnx}\right)}{{x}^{\mathrm{2}} −{x}\:+\mathrm{1}}{dx} \\ $$

Question Number 60727 Answers: 0 Comments: 2

calculate ∫_1 ^(+∞) ((ln(lnx))/(1+x^2 ))dx

$${calculate}\:\int_{\mathrm{1}} ^{+\infty} \:\frac{{ln}\left({lnx}\right)}{\mathrm{1}+{x}^{\mathrm{2}} }{dx} \\ $$

Question Number 60725 Answers: 0 Comments: 2

x = Σ_(0≤i≤j≤2019) ( _( j)^(2019) )( _i^j )

$${x}\:\:=\:\:\underset{\mathrm{0}\leqslant{i}\leqslant{j}\leqslant\mathrm{2019}} {\sum}\:\left(\:_{\:\:\:\:{j}} ^{\mathrm{2019}} \:\right)\left(\:\:_{{i}} ^{{j}} \:\:\right)\: \\ $$

Question Number 60723 Answers: 0 Comments: 10

solve for x (√(a−(√(a+x)))) + (√(a+(√(a−x)))) = 2x

$${solve}\:{for}\:{x}\: \\ $$$$\sqrt{{a}−\sqrt{{a}+{x}}}\:+\:\sqrt{{a}+\sqrt{{a}−{x}}}\:=\:\mathrm{2}{x} \\ $$

Question Number 60717 Answers: 0 Comments: 1

Question Number 60706 Answers: 0 Comments: 2

let f(x) =(√(1+x^2 )) 1) let U_n =f^((n)) (x) prove that Σ_(k=0) ^n C_n ^k U_k U_(n+1−k) =0 for n≥2 2) developp f at integr serie .

$${let}\:{f}\left({x}\right)\:=\sqrt{\mathrm{1}+{x}^{\mathrm{2}} } \\ $$$$\left.\mathrm{1}\right)\:{let}\:{U}_{{n}} ={f}^{\left({n}\right)} \left({x}\right)\:\:{prove}\:{that}\:\sum_{{k}=\mathrm{0}} ^{{n}} \:{C}_{{n}} ^{{k}} \:{U}_{{k}} {U}_{{n}+\mathrm{1}−{k}} =\mathrm{0}\:\:{for}\:{n}\geqslant\mathrm{2} \\ $$$$\left.\mathrm{2}\right)\:{developp}\:{f}\:{at}\:{integr}\:{serie}\:. \\ $$

Question Number 60705 Answers: 1 Comments: 0

Question Number 60716 Answers: 1 Comments: 1

Question Number 60702 Answers: 0 Comments: 0

Question Number 60701 Answers: 0 Comments: 1

let f(x) =e^(−x^2 ) ln(2−x) developp f at integr serie .

$${let}\:{f}\left({x}\right)\:={e}^{−{x}^{\mathrm{2}} } {ln}\left(\mathrm{2}−{x}\right)\:\:\:{developp}\:{f}\:{at}\:{integr}\:{serie}\:. \\ $$

Question Number 60697 Answers: 1 Comments: 1

Question Number 60695 Answers: 0 Comments: 1

solve (√(3+x^2 ))y^(′′) −(2x+1)y^′ =x^2 e^(−x^2 )

$${solve}\:\sqrt{\mathrm{3}+{x}^{\mathrm{2}} }{y}^{''} \:\:\:\:−\left(\mathrm{2}{x}+\mathrm{1}\right){y}^{'} \:={x}^{\mathrm{2}} \:{e}^{−{x}^{\mathrm{2}} \:\:\:} \\ $$

Question Number 60694 Answers: 0 Comments: 0

solve (x^3 −x)y^(′′) −2x y^′ +3y =xln(1+x)

$${solve}\:\:\left({x}^{\mathrm{3}} −{x}\right){y}^{''} \:\:\:−\mathrm{2}{x}\:{y}^{'} \:+\mathrm{3}{y}\:={xln}\left(\mathrm{1}+{x}\right) \\ $$

Question Number 60693 Answers: 0 Comments: 0

solve (2+e^(−x) )y^′ +(2x+e^x )y =e^x sinx

$${solve}\:\:\left(\mathrm{2}+{e}^{−{x}} \right){y}^{'} \:\:+\left(\mathrm{2}{x}+{e}^{{x}} \right){y}\:={e}^{{x}} {sinx}\: \\ $$

Question Number 60692 Answers: 0 Comments: 0

find ∫ arctan(2cosx)dx

$${find}\:\:\int\:\:{arctan}\left(\mathrm{2}{cosx}\right){dx}\: \\ $$

Question Number 60691 Answers: 0 Comments: 1

calculate f(a) = ∫ (1−(a/x^2 )) arctan(x+(a/x))dx with a real .

$${calculate}\:{f}\left({a}\right)\:=\:\int\:\:\:\left(\mathrm{1}−\frac{{a}}{{x}^{\mathrm{2}} }\right)\:{arctan}\left({x}+\frac{{a}}{{x}}\right){dx}\:\:\:{with}\:{a}\:{real}\:. \\ $$

Question Number 60690 Answers: 0 Comments: 0

find ∫ (x+3)(√((1−x^2 )/(1+x^2 )))dx

$${find}\:\int\:\left({x}+\mathrm{3}\right)\sqrt{\frac{\mathrm{1}−{x}^{\mathrm{2}} }{\mathrm{1}+{x}^{\mathrm{2}} }}{dx}\: \\ $$

Question Number 60688 Answers: 0 Comments: 0

find ∫ e^(−x) (√((3−x)/(3+x)))dx

$${find}\:\int\:\:\:{e}^{−{x}} \sqrt{\frac{\mathrm{3}−{x}}{\mathrm{3}+{x}}}{dx} \\ $$

Question Number 60687 Answers: 1 Comments: 2

calculate ∫ (((√(1+x^2 ))−2x)/((√(1+x^2 )) +2x)) dx

$${calculate}\:\:\int\:\frac{\sqrt{\mathrm{1}+{x}^{\mathrm{2}} }−\mathrm{2}{x}}{\sqrt{\mathrm{1}+{x}^{\mathrm{2}} }\:+\mathrm{2}{x}}\:{dx} \\ $$

Question Number 60685 Answers: 1 Comments: 1

find I_n =∫_0 ^(π/2) ((1−cos(nx))/(sin^2 (nx)))dx

$${find}\:{I}_{{n}} =\int_{\mathrm{0}} ^{\frac{\pi}{\mathrm{2}}} \:\frac{\mathrm{1}−{cos}\left({nx}\right)}{{sin}^{\mathrm{2}} \left({nx}\right)}{dx}\: \\ $$

Question Number 60686 Answers: 0 Comments: 0

let f(x) =cos(2x) ,2π periodic , developp f at fourier serie

$${let}\:{f}\left({x}\right)\:={cos}\left(\mathrm{2}{x}\right)\:\:\:\:,\mathrm{2}\pi\:{periodic}\:,\:\:{developp}\:{f}\:{at}\:{fourier}\:{serie} \\ $$

Question Number 60683 Answers: 0 Comments: 0

find A_n =∫_0 ^(π/4) sin^n xdx with n integr natural .

$${find}\:{A}_{{n}} =\int_{\mathrm{0}} ^{\frac{\pi}{\mathrm{4}}} \:{sin}^{{n}} {xdx}\:\:\:\:{with}\:{n}\:{integr}\:{natural}\:. \\ $$

Question Number 60682 Answers: 0 Comments: 1

simplify S_n =Σ_(k=0) ^n sin^k (x)cos(kx)

$${simplify}\:\:\:\:{S}_{{n}} =\sum_{{k}=\mathrm{0}} ^{{n}} \:\:{sin}^{{k}} \left({x}\right){cos}\left({kx}\right)\:\:\: \\ $$

Question Number 60681 Answers: 0 Comments: 1

calculate L(e^(−2x) sin(αx)) α real and L laplace transform

$${calculate}\:\:{L}\left({e}^{−\mathrm{2}{x}} {sin}\left(\alpha{x}\right)\right)\:\:\:\:\alpha\:{real}\:\:\:{and}\:{L}\:{laplace}\:{transform} \\ $$

Question Number 60680 Answers: 0 Comments: 2

study the integral ∫_0 ^1 (x/(ln(1−x)))dx

$${study}\:{the}\:{integral}\:\int_{\mathrm{0}} ^{\mathrm{1}} \:\frac{{x}}{{ln}\left(\mathrm{1}−{x}\right)}{dx} \\ $$

Question Number 60679 Answers: 0 Comments: 1

calculate ∫_0 ^∞ ((ln(1+e^(−x^2 ) ))/(x^2 +4)) dx

$${calculate}\:\int_{\mathrm{0}} ^{\infty} \:\:\:\frac{{ln}\left(\mathrm{1}+{e}^{−{x}^{\mathrm{2}} } \right)}{{x}^{\mathrm{2}} \:+\mathrm{4}}\:{dx} \\ $$

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