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Question Number 32288 Answers: 0 Comments: 0

study the function f(x)=(x^2 /(x+1)) e^(1/x) .

$${study}\:{the}\:{function}\:{f}\left({x}\right)=\frac{{x}^{\mathrm{2}} }{{x}+\mathrm{1}}\:{e}^{\frac{\mathrm{1}}{{x}}} \:\:. \\ $$

Question Number 32287 Answers: 0 Comments: 0

1) for x>0 prove that (1/(x+1)) ≤ln(x+1)−lnx ≤ (1/x) 2) let u_n = Σ_(p=1) ^(kn) (1/p) find lim_(n→∞ ) u_n .

$$\left.\mathrm{1}\right)\:{for}\:{x}>\mathrm{0}\:{prove}\:{that}\:\frac{\mathrm{1}}{{x}+\mathrm{1}}\:\leqslant{ln}\left({x}+\mathrm{1}\right)−{lnx}\:\leqslant\:\frac{\mathrm{1}}{{x}} \\ $$$$\left.\mathrm{2}\right)\:{let}\:{u}_{{n}} =\:\sum_{{p}=\mathrm{1}} ^{{kn}} \:\frac{\mathrm{1}}{{p}}\:\:\:{find}\:{lim}_{{n}\rightarrow\infty\:} \:{u}_{{n}} . \\ $$

Question Number 32286 Answers: 0 Comments: 0

calculate lim_(x→0) (((e^x /(√(1+x))) −1−(x/2))/x^2 ) .

$${calculate}\:{lim}_{{x}\rightarrow\mathrm{0}} \:\:\:\:\frac{\frac{{e}^{{x}} }{\sqrt{\mathrm{1}+{x}}}\:−\mathrm{1}−\frac{{x}}{\mathrm{2}}}{{x}^{\mathrm{2}} }\:. \\ $$

Question Number 32281 Answers: 0 Comments: 0

calculate lim_(x→∞) (√(x^2 +x+1)) −(√(x^2 −x+1)) .

$${calculate}\:{lim}_{{x}\rightarrow\infty} \sqrt{{x}^{\mathrm{2}} +{x}+\mathrm{1}}\:−\sqrt{{x}^{\mathrm{2}} \:−{x}+\mathrm{1}}\:\:. \\ $$

Question Number 32280 Answers: 0 Comments: 0

let u_n = e^(1/(n^2 +1)) −1 1) find a equivalent of u_n and lim_(n→∞) u_n 2) study the convergence of Σu_n .

$${let}\:{u}_{{n}} =\:{e}^{\frac{\mathrm{1}}{{n}^{\mathrm{2}} \:+\mathrm{1}}} \:\:−\mathrm{1} \\ $$$$\left.\mathrm{1}\right)\:{find}\:{a}\:{equivalent}\:{of}\:{u}_{{n}} \:{and}\:{lim}_{{n}\rightarrow\infty} {u}_{{n}} \\ $$$$\left.\mathrm{2}\right)\:{study}\:{the}\:{convergence}\:{of}\:\:\Sigma{u}_{{n}} \:. \\ $$

Question Number 32279 Answers: 0 Comments: 0

find lim_(x→0) ((tan^2 x)/((1−cosx))) .((e^x −1)/x)

$${find}\:\:{lim}_{{x}\rightarrow\mathrm{0}} \:\:\:\frac{{tan}^{\mathrm{2}} {x}}{\left(\mathrm{1}−{cosx}\right)}\:.\frac{{e}^{{x}} \:−\mathrm{1}}{{x}}\:\:\: \\ $$

Question Number 32282 Answers: 0 Comments: 0

let give f(x)=(√(1+x^2 )) find f^((n)) (o) .

$${let}\:{give}\:{f}\left({x}\right)=\sqrt{\mathrm{1}+{x}^{\mathrm{2}} }\:\:\:{find}\:\:{f}^{\left({n}\right)} \left({o}\right)\:.\: \\ $$

Question Number 32278 Answers: 0 Comments: 0

calculate lim_(x→+∞) (x−1)cos((π/x)) .

$${calculate}\:{lim}_{{x}\rightarrow+\infty} \left({x}−\mathrm{1}\right){cos}\left(\frac{\pi}{{x}}\right)\:. \\ $$

Question Number 32277 Answers: 0 Comments: 0

for x_i ∈[0,1] prove that (1−x_1 )(1−x_2 )....(1−x_n ) ≥1−(x_1 +x_2 +.... +x_n ).

$${for}\:{x}_{{i}} \:\in\left[\mathrm{0},\mathrm{1}\right]\:{prove}\:{that} \\ $$$$\left(\mathrm{1}−{x}_{\mathrm{1}} \right)\left(\mathrm{1}−{x}_{\mathrm{2}} \right)....\left(\mathrm{1}−{x}_{{n}} \right)\:\geqslant\mathrm{1}−\left({x}_{\mathrm{1}} +{x}_{\mathrm{2}} \:+....\:+{x}_{{n}} \right). \\ $$

Question Number 32276 Answers: 0 Comments: 0

prove that Σ_(i=1) ^n (Π_(j=0) ^p (i+j))=((n(n+1)(n+2)...(n+p+1))/(p+2))

$${prove}\:{that}\:\sum_{{i}=\mathrm{1}} ^{{n}} \:\left(\prod_{{j}=\mathrm{0}} ^{{p}} \left({i}+{j}\right)\right)=\frac{{n}\left({n}+\mathrm{1}\right)\left({n}+\mathrm{2}\right)...\left({n}+{p}+\mathrm{1}\right)}{{p}+\mathrm{2}} \\ $$

Question Number 32285 Answers: 0 Comments: 0

let f(x)= x^(n−1) ln(1+x) with n integr and n≥1 1) calculate f^((p)) (x) 2) find f^((n)) (x)

$${let}\:{f}\left({x}\right)=\:{x}^{{n}−\mathrm{1}} {ln}\left(\mathrm{1}+{x}\right)\:{with}\:{n}\:{integr}\:{and}\:{n}\geqslant\mathrm{1} \\ $$$$\left.\mathrm{1}\right)\:{calculate}\:{f}^{\left({p}\right)} \left({x}\right) \\ $$$$\left.\mathrm{2}\right)\:{find}\:{f}^{\left({n}\right)} \left({x}\right) \\ $$

Question Number 32284 Answers: 0 Comments: 0

prove that ∀ x∈[0,(π/4)] x≤tanx≤2x 2) find α_n and β_n from R / α_n ≤ Σ_(k=2) ^n tan((π/(2n)))≤ β_n

$${prove}\:{that}\:\forall\:{x}\in\left[\mathrm{0},\frac{\pi}{\mathrm{4}}\right]\:\:{x}\leqslant{tanx}\leqslant\mathrm{2}{x} \\ $$$$\left.\mathrm{2}\right)\:{find}\:\alpha_{{n}} \:{and}\:\beta_{{n}} \:{from}\:{R}\:/\:\:\alpha_{{n}} \leqslant\:\sum_{{k}=\mathrm{2}} ^{{n}} \:{tan}\left(\frac{\pi}{\mathrm{2}{n}}\right)\leqslant\:\beta_{{n}} \\ $$

Question Number 32283 Answers: 1 Comments: 1

let give f(x)=x+2 −(√(x+1)) 1) find f^(−1) (x) inverse of f(x) 2) calculate (f^(−1) )^′ (x) .

$${let}\:{give}\:{f}\left({x}\right)={x}+\mathrm{2}\:−\sqrt{{x}+\mathrm{1}} \\ $$$$\left.\mathrm{1}\right)\:{find}\:{f}^{−\mathrm{1}} \left({x}\right)\:{inverse}\:{of}\:{f}\left({x}\right) \\ $$$$\left.\mathrm{2}\right)\:{calculate}\:\left({f}^{−\mathrm{1}} \right)^{'} \left({x}\right)\:. \\ $$

Question Number 32274 Answers: 0 Comments: 0

prove that Σ_(k=0) ^n (2^k /(x^2^k +1)) = (1/(x−1)) − (2^(n+1) /(x^(2^(n+1) ) −1)) .

$${prove}\:{that}\:\:\sum_{{k}=\mathrm{0}} ^{{n}} \:\:\:\frac{\mathrm{2}^{{k}} }{{x}^{\mathrm{2}^{{k}} } \:+\mathrm{1}}\:=\:\frac{\mathrm{1}}{{x}−\mathrm{1}}\:−\:\frac{\mathrm{2}^{{n}+\mathrm{1}} }{{x}^{\mathrm{2}^{{n}+\mathrm{1}} \:} −\mathrm{1}}\:\:. \\ $$

Question Number 32273 Answers: 1 Comments: 1

let put u_n =Σ_(k=1) ^n k(k!) 1) prove that u_n =(n+1)! −1 2) study the convergence of Σ_(n=1) ^∞ (1/u_n ) .

$${let}\:{put}\:{u}_{{n}} =\sum_{{k}=\mathrm{1}} ^{{n}} \:{k}\left({k}!\right) \\ $$$$\left.\mathrm{1}\right)\:{prove}\:{that}\:{u}_{{n}} =\left({n}+\mathrm{1}\right)!\:−\mathrm{1} \\ $$$$\left.\mathrm{2}\right)\:{study}\:{the}\:{convergence}\:{of}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\:\frac{\mathrm{1}}{{u}_{{n}} }\:. \\ $$

Question Number 32271 Answers: 0 Comments: 0

study the convergence of Σ_(n=1) ^∞ (((−1)^(n−1) )/n^(1/3) ) .

$${study}\:{the}\:{convergence}\:{of}\:\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\:\frac{\left(−\mathrm{1}\right)^{{n}−\mathrm{1}} }{{n}^{\frac{\mathrm{1}}{\mathrm{3}}} }\:. \\ $$

Question Number 32269 Answers: 1 Comments: 0

find ∫ (x^3 /(√(1+x^2 ))) dx

$${find}\:\int\:\:\frac{{x}^{\mathrm{3}} }{\sqrt{\mathrm{1}+{x}^{\mathrm{2}} }}\:{dx} \\ $$

Question Number 32266 Answers: 0 Comments: 0

Question Number 32264 Answers: 0 Comments: 1

Question Number 32258 Answers: 2 Comments: 0

find ∫ (1/(2−x^2 )) dx

$${find} \\ $$$$\int\:\frac{\mathrm{1}}{\mathrm{2}−{x}^{\mathrm{2}} }\:{dx} \\ $$

Question Number 32256 Answers: 0 Comments: 0

1)let a>0 and x>0 find lim _(x→a) ((e^(−ax^2 ) − e^(−xa^2 ) )/(a^x −x^a )) . 2)find lim_(x→2) ((e^(−2x^2 ) − e^(−4x) )/(2^x −x^2 )) .

$$\left.\mathrm{1}\right){let}\:{a}>\mathrm{0}\:{and}\:{x}>\mathrm{0}\:{find}\:{lim}\:_{{x}\rightarrow{a}} \:\frac{{e}^{−{ax}^{\mathrm{2}} } \:−\:{e}^{−{xa}^{\mathrm{2}} } }{{a}^{{x}} \:−{x}^{{a}} }\:. \\ $$$$\left.\mathrm{2}\right){find}\:{lim}_{{x}\rightarrow\mathrm{2}} \:\:\:\frac{{e}^{−\mathrm{2}{x}^{\mathrm{2}} } \:−\:{e}^{−\mathrm{4}{x}} }{\mathrm{2}^{{x}} \:−{x}^{\mathrm{2}} }\:. \\ $$

Question Number 32255 Answers: 0 Comments: 0

le x>0 and a>0 find lim_(x→a) ((log_a (x) −log_x (a))/(sinx −sina)) .

$${le}\:{x}>\mathrm{0}\:{and}\:{a}>\mathrm{0}\:{find}\:{lim}_{{x}\rightarrow{a}} \:\frac{{log}_{{a}} \:\left({x}\right)\:−{log}_{{x}} \left({a}\right)}{{sinx}\:−{sina}}\:\:. \\ $$

Question Number 32265 Answers: 0 Comments: 0

Question Number 32242 Answers: 1 Comments: 0

A company manufactures two types of products; X ($4.50 profit per item x) and Y ($3.00 profit per item y). These items are built using both machine time and manual labour. The X product requires 3 hours of machine time and two hours of manual labour. The Y product requires 3 hours of machine time and no manual labour. If the week′s supply of manual labour is limited to 8 hours and machine time to 15 hours, write down all inequalities involving x and y.

$$\mathrm{A}\:\mathrm{company}\:\mathrm{manufactures}\:\mathrm{two}\:\mathrm{types}\:\mathrm{of}\:\mathrm{products}; \\ $$$$\mathrm{X}\:\left(\$\mathrm{4}.\mathrm{50}\:\mathrm{profit}\:\mathrm{per}\:\mathrm{item}\:\mathrm{x}\right)\:\mathrm{and}\:\mathrm{Y}\:\left(\$\mathrm{3}.\mathrm{00}\:\mathrm{profit}\:\mathrm{per}\right. \\ $$$$\left.\mathrm{item}\:\mathrm{y}\right).\:\mathrm{These}\:\mathrm{items}\:\mathrm{are}\:\mathrm{built}\:\mathrm{using}\:\mathrm{both}\:\mathrm{machine} \\ $$$$\mathrm{time}\:\mathrm{and}\:\mathrm{manual}\:\mathrm{labour}.\:\mathrm{The}\:\mathrm{X}\:\mathrm{product}\:\mathrm{requires} \\ $$$$\mathrm{3}\:\mathrm{hours}\:\mathrm{of}\:\mathrm{machine}\:\mathrm{time}\:\mathrm{and}\:\mathrm{two}\:\mathrm{hours}\:\mathrm{of}\:\mathrm{manual} \\ $$$$\mathrm{labour}.\:\mathrm{The}\:\mathrm{Y}\:\mathrm{product}\:\mathrm{requires}\:\mathrm{3}\:\mathrm{hours}\:\mathrm{of}\:\mathrm{machine} \\ $$$$\mathrm{time}\:\mathrm{and}\:\mathrm{no}\:\mathrm{manual}\:\mathrm{labour}.\:\mathrm{If}\:\mathrm{the}\:\mathrm{week}'\mathrm{s}\:\mathrm{supply}\:\mathrm{of}\: \\ $$$$\mathrm{manual}\:\mathrm{labour}\:\mathrm{is}\:\mathrm{limited}\:\mathrm{to}\:\mathrm{8}\:\mathrm{hours}\:\mathrm{and}\:\mathrm{machine} \\ $$$$\mathrm{time}\:\mathrm{to}\:\mathrm{15}\:\mathrm{hours},\:\mathrm{write}\:\mathrm{down}\:\mathrm{all}\:\mathrm{inequalities}\: \\ $$$$\mathrm{involving}\:\mathrm{x}\:\mathrm{and}\:\mathrm{y}. \\ $$

Question Number 32241 Answers: 0 Comments: 1

Question Number 32240 Answers: 1 Comments: 0

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