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Question Number 60817 Answers: 4 Comments: 2

V=(4/3)𝛑R^3 prove

$$\boldsymbol{\mathrm{V}}=\frac{\mathrm{4}}{\mathrm{3}}\boldsymbol{\pi\mathrm{R}}^{\mathrm{3}} \:\:\:\boldsymbol{\mathrm{prove}} \\ $$

Question Number 60816 Answers: 1 Comments: 0

S=4𝛑R^2 prove

$$\boldsymbol{\mathrm{S}}=\mathrm{4}\boldsymbol{\pi\mathrm{R}}^{\mathrm{2}} \:\:\:\boldsymbol{\mathrm{prove}} \\ $$

Question Number 60814 Answers: 1 Comments: 0

find x given that 9^(sin^2 x) +9^(cos^2 x) =2

$${find}\:{x}\:{given}\:{that} \\ $$$$\mathrm{9}^{{sin}^{\mathrm{2}} {x}} +\mathrm{9}^{{cos}^{\mathrm{2}} {x}} =\mathrm{2}\: \\ $$$$ \\ $$

Question Number 60812 Answers: 0 Comments: 5

Question Number 60797 Answers: 0 Comments: 2

∫(e^w /w^(n+1) )dw, n∈N

$$\int\frac{{e}^{{w}} }{{w}^{{n}+\mathrm{1}} }{dw},\:{n}\in\mathbb{N} \\ $$

Question Number 60791 Answers: 1 Comments: 2

∫(e^n /x^(n+1) )dx, n∈N

$$\int\frac{{e}^{{n}} }{{x}^{{n}+\mathrm{1}} }{dx},\:\mathrm{n}\in\mathbb{N} \\ $$

Question Number 60788 Answers: 2 Comments: 1

Question Number 60783 Answers: 0 Comments: 2

∫_(−∞) ^∞ sin((1/(1+x^2 ))) dx

$$\underset{−\infty} {\overset{\infty} {\int}}{sin}\left(\frac{\mathrm{1}}{\mathrm{1}+{x}^{\mathrm{2}} }\right)\:{dx} \\ $$

Question Number 60775 Answers: 0 Comments: 1

Question Number 60765 Answers: 0 Comments: 2

express in partial fraction 14/(x^2 +3)(x+2)

$${express}\:{in}\:{partial}\:{fraction}\:\mathrm{14}/\left({x}^{\mathrm{2}} +\mathrm{3}\right)\left({x}+\mathrm{2}\right) \\ $$

Question Number 60756 Answers: 1 Comments: 1

express in partial fraction 5/(x−2)(x+3)^2

$${express}\:{in}\:{partial}\:{fraction}\:\mathrm{5}/\left({x}−\mathrm{2}\right)\left({x}+\mathrm{3}\right)^{\mathrm{2}} \\ $$

Question Number 60748 Answers: 1 Comments: 1

Question Number 60745 Answers: 4 Comments: 5

Question Number 60739 Answers: 1 Comments: 4

evaluate i.∫ (((x+1)/(x−1)))dx ii. ∫_0 ^π (2cosxsinx)dx iii. ∫_((π/(3 )) ) ^π (((sin2x)/(cos2x)))dx

$${evaluate}\:\: \\ $$$${i}.\int\:\left(\frac{{x}+\mathrm{1}}{{x}−\mathrm{1}}\right){dx} \\ $$$${ii}.\:\:\int_{\mathrm{0}} ^{\pi} \left(\mathrm{2}{cosxsinx}\right){dx}\:\: \\ $$$${iii}.\:\:\int_{\frac{\pi}{\mathrm{3}\:}\:} ^{\pi} \left(\frac{{sin}\mathrm{2}{x}}{{cos}\mathrm{2}{x}}\right){dx} \\ $$

Question Number 60735 Answers: 3 Comments: 0

express in partial fraction 3/(x+1)(x^2 −4)

$${express}\:{in}\:{partial}\:{fraction}\:\mathrm{3}/\left({x}+\mathrm{1}\right)\left({x}^{\mathrm{2}} −\mathrm{4}\right) \\ $$

Question Number 60734 Answers: 1 Comments: 4

Find the product of the real roots of the equation (x + 2 + (√(x^2 + 4x + 3)))^5 − 32(x + 2 − (√(x^2 + 4x + 3)))^5 = 31

$$\mathrm{Find}\:\mathrm{the}\:\mathrm{product}\:\mathrm{of}\:\mathrm{the}\:\mathrm{real}\:\mathrm{roots}\:\mathrm{of}\:\mathrm{the}\:\mathrm{equation} \\ $$$$\:\:\:\:\:\:\:\:\:\left(\mathrm{x}\:+\:\mathrm{2}\:+\:\sqrt{\mathrm{x}^{\mathrm{2}} \:+\:\mathrm{4x}\:+\:\mathrm{3}}\right)^{\mathrm{5}} \:−\:\:\mathrm{32}\left(\mathrm{x}\:+\:\mathrm{2}\:−\:\sqrt{\mathrm{x}^{\mathrm{2}} \:+\:\mathrm{4x}\:+\:\mathrm{3}}\right)^{\mathrm{5}} \:\:=\:\:\mathrm{31} \\ $$

Question Number 60731 Answers: 0 Comments: 0

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: 8

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

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