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Question Number 45968 Answers: 1 Comments: 2

1)find Σ_(n=1) ^∞ ((cos(nx))/n) and Σ_(n=1) ^∞ ((sin(nx))/n) 2) calculate Σ_(n=1) ^∞ (1/n)cos(((2nπ)/3)) and Σ_(n=1) ^∞ (1/n)sin(((2nπ)/3))

$$\left.\mathrm{1}\right){find}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\:\frac{{cos}\left({nx}\right)}{{n}}\:{and}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\frac{{sin}\left({nx}\right)}{{n}} \\ $$$$\left.\mathrm{2}\right)\:{calculate}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\frac{\mathrm{1}}{{n}}{cos}\left(\frac{\mathrm{2}{n}\pi}{\mathrm{3}}\right)\:{and}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\frac{\mathrm{1}}{{n}}{sin}\left(\frac{\mathrm{2}{n}\pi}{\mathrm{3}}\right) \\ $$

Question Number 45969 Answers: 0 Comments: 0

1) find f(x)=∫_0 ^1 ln(1+ix)dx 2) calculate f^′ (x)

$$\left.\mathrm{1}\right)\:{find}\:\:{f}\left({x}\right)=\int_{\mathrm{0}} ^{\mathrm{1}} {ln}\left(\mathrm{1}+{ix}\right){dx} \\ $$$$\left.\mathrm{2}\right)\:{calculate}\:{f}^{'} \left({x}\right) \\ $$

Question Number 45961 Answers: 0 Comments: 0

let f_n (x)=(−1)^n ln(1+(x^2 /(n(1+x^2 )))) and f(x)=Σ f_n (x) find lim_(x→+∞) f(x).

$${let}\:{f}_{{n}} \left({x}\right)=\left(−\mathrm{1}\right)^{{n}} \:{ln}\left(\mathrm{1}+\frac{{x}^{\mathrm{2}} }{{n}\left(\mathrm{1}+{x}^{\mathrm{2}} \right)}\right)\:{and}\:{f}\left({x}\right)=\Sigma\:{f}_{{n}} \left({x}\right) \\ $$$${find}\:{lim}_{{x}\rightarrow+\infty} {f}\left({x}\right). \\ $$

Question Number 45960 Answers: 1 Comments: 0

find f(x)=Σ_(n=1) ^∞ ((x^n sin(nx))/n)

$${find}\:{f}\left({x}\right)=\sum_{{n}=\mathrm{1}} ^{\infty} \:\:\frac{{x}^{{n}} {sin}\left({nx}\right)}{{n}} \\ $$

Question Number 45957 Answers: 1 Comments: 1

let u_n =Σ_(k=1) ^n (1/(k!(n−k)!)) calculate Σ_(n=1) ^∞ u_n

$${let}\:{u}_{{n}} =\sum_{{k}=\mathrm{1}} ^{{n}} \:\frac{\mathrm{1}}{{k}!\left({n}−{k}\right)!}\:\:{calculate}\:\sum_{{n}=\mathrm{1}} ^{\infty} {u}_{{n}} \\ $$

Question Number 45962 Answers: 0 Comments: 0

study the convervence of Σ_(n=1) ^∞ (((√(n+1))−(√n))/(nln(n+1)))

$${study}\:{the}\:{convervence}\:{of}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\frac{\sqrt{{n}+\mathrm{1}}−\sqrt{{n}}}{{nln}\left({n}+\mathrm{1}\right)} \\ $$

Question Number 45963 Answers: 1 Comments: 1

find the value of Σ_(n=1) ^∞ (n/((4n^2 −1)^2 )) .

$${find}\:{the}\:{value}\:{of}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\:\frac{{n}}{\left(\mathrm{4}{n}^{\mathrm{2}} −\mathrm{1}\right)^{\mathrm{2}} }\:. \\ $$

Question Number 45941 Answers: 1 Comments: 0

Find 0<θ<2π with x,y ∈R x∙sinθ=y∙cosθ

$$\mathrm{Find}\:\mathrm{0}<\theta<\mathrm{2}\pi\:\mathrm{with}\:{x},{y}\:\in\mathbb{R} \\ $$$$ \\ $$$${x}\centerdot{sin}\theta={y}\centerdot{cos}\theta \\ $$

Question Number 45936 Answers: 0 Comments: 1

Question Number 45932 Answers: 1 Comments: 4

Show that: ((1.2^2 + 2.3^2 + ... + n(n + 1)^2 )/(1^2 .2 + 2^2 .3 + ... + n^2 (n + 1))) = ((3n + 5)/(3n + 1))

$$\mathrm{Show}\:\mathrm{that}:\:\:\:\:\frac{\mathrm{1}.\mathrm{2}^{\mathrm{2}} \:+\:\mathrm{2}.\mathrm{3}^{\mathrm{2}} \:+\:...\:+\:\mathrm{n}\left(\mathrm{n}\:+\:\mathrm{1}\right)^{\mathrm{2}} }{\mathrm{1}^{\mathrm{2}} .\mathrm{2}\:+\:\mathrm{2}^{\mathrm{2}} .\mathrm{3}\:+\:...\:+\:\mathrm{n}^{\mathrm{2}} \left(\mathrm{n}\:+\:\mathrm{1}\right)}\:\:=\:\:\frac{\mathrm{3n}\:+\:\mathrm{5}}{\mathrm{3n}\:+\:\mathrm{1}} \\ $$

Question Number 45931 Answers: 0 Comments: 0

Question Number 45930 Answers: 1 Comments: 0

Question Number 45920 Answers: 1 Comments: 0

Question Number 45916 Answers: 1 Comments: 0

∫f(x)dx=f(×)+c

$$\int{f}\left({x}\right){dx}={f}\left(×\right)+{c} \\ $$

Question Number 45901 Answers: 0 Comments: 1

Question Number 45898 Answers: 1 Comments: 1

Question Number 45907 Answers: 1 Comments: 3

7×(6+x)−10=60 plz help me

$$\mathrm{7}×\left(\mathrm{6}+\mathrm{x}\right)−\mathrm{10}=\mathrm{60}\:\:\:\:\:\mathrm{plz}\:\mathrm{help}\:\mathrm{me} \\ $$

Question Number 45905 Answers: 2 Comments: 0

Question Number 45896 Answers: 2 Comments: 2

solve for x x^4 −4x+1=0

$$\boldsymbol{{solve}}\:\boldsymbol{{for}}\:\boldsymbol{{x}} \\ $$$$\boldsymbol{{x}}^{\mathrm{4}} −\mathrm{4}\boldsymbol{{x}}+\mathrm{1}=\mathrm{0} \\ $$

Question Number 45885 Answers: 1 Comments: 3

Question Number 45879 Answers: 0 Comments: 0

2^x =log_(0.5) x find x−?

$$\mathrm{2}^{\boldsymbol{{x}}} =\boldsymbol{{log}}_{\mathrm{0}.\mathrm{5}} \boldsymbol{{x}} \\ $$$$\boldsymbol{{find}}\:\:\boldsymbol{{x}}−? \\ $$

Question Number 45876 Answers: 1 Comments: 0

Question Number 45856 Answers: 0 Comments: 1

Prove that the length of the perpendicular from the origin to the plane passing through point a^→ and containing the line r^→ =b^→ +λc^→ is (([a^→ b^→ c^→ ])/(∣b^→ ×c^→ +c^→ ×a^→ ∣)) . Here [a^→ b^→ c^→ ] = scalar triple product.

Question Number 45846 Answers: 1 Comments: 1

ph=−log[H]

$${ph}=−{log}\left[{H}\right] \\ $$

Question Number 45844 Answers: 1 Comments: 1

If y=((sec^2 θ−tan θ)/(sec^2 θ+tan θ)) , then

$$\mathrm{If}\:\:{y}=\frac{\mathrm{sec}^{\mathrm{2}} \theta−\mathrm{tan}\:\theta}{\mathrm{sec}^{\mathrm{2}} \theta+\mathrm{tan}\:\theta}\:,\:\mathrm{then} \\ $$

Question Number 45842 Answers: 1 Comments: 8

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