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Question Number 167819 Answers: 0 Comments: 0

let f(x)=e^(−x) arctan(2x) find f^((n)) (0)

$${let}\:{f}\left({x}\right)={e}^{−{x}} {arctan}\left(\mathrm{2}{x}\right) \\ $$$${find}\:{f}^{\left({n}\right)} \left(\mathrm{0}\right) \\ $$

Question Number 167800 Answers: 0 Comments: 3

5^(2x) = 2.10^x −4^(2x) (((x−4)^(x^2 +2) ))^(1/((x+2)^(−1) )) =?

$$\:\:\:\:\:\:\mathrm{5}^{\mathrm{2}{x}} \:=\:\mathrm{2}.\mathrm{10}^{{x}} −\mathrm{4}^{\mathrm{2}{x}} \: \\ $$$$\:\:\:\:\:\sqrt[{\left({x}+\mathrm{2}\right)^{−\mathrm{1}} }]{\left({x}−\mathrm{4}\right)^{{x}^{\mathrm{2}} +\mathrm{2}} }=?\: \\ $$

Question Number 167795 Answers: 2 Comments: 1

Question Number 167787 Answers: 2 Comments: 0

Question Number 167785 Answers: 0 Comments: 0

Question Number 167784 Answers: 0 Comments: 0

Question Number 167782 Answers: 1 Comments: 0

etudier l′existance de limite en (0,0) f(x,y)=((x^2 y)/(x+y))

$${etudier}\:{l}'{existance}\:{de}\:{limite}\:{en}\:\left(\mathrm{0},\mathrm{0}\right) \\ $$$${f}\left({x},{y}\right)=\frac{{x}^{\mathrm{2}} {y}}{{x}+{y}} \\ $$

Question Number 167808 Answers: 1 Comments: 1

Question Number 167777 Answers: 1 Comments: 0

Question Number 167776 Answers: 2 Comments: 0

Question Number 167775 Answers: 1 Comments: 1

Question Number 167765 Answers: 0 Comments: 0

show that two permutations are conjugate if their matrices are similar

$$ \\ $$show that two permutations are conjugate if their matrices are similar

Question Number 167773 Answers: 2 Comments: 0

Calculate ∫((xtan x)/(cos^4 x))dx

$${Calculate} \\ $$$$\int\frac{{x}\mathrm{tan}\:{x}}{\mathrm{cos}\:^{\mathrm{4}} {x}}{dx} \\ $$

Question Number 167757 Answers: 1 Comments: 1

Calculate ∫sec^2 xsec xdx

$${Calculate} \\ $$$$\int\mathrm{sec}\:^{\mathrm{2}} {x}\mathrm{sec}\:{xdx} \\ $$

Question Number 167746 Answers: 1 Comments: 1

log_((x^2 +2)) (x^2 +4x)=?

$${log}_{\left({x}^{\mathrm{2}} +\mathrm{2}\right)} \left({x}^{\mathrm{2}} +\mathrm{4}{x}\right)=? \\ $$

Question Number 167740 Answers: 0 Comments: 0

I_n =∫_0 ^(π/4) (1/(cos^(2n+1) x))dx Prove by parts that: 2nI_n =(2n−1)I_(n−1) +(2^n /( (√2)))

$${I}_{{n}} =\int_{\mathrm{0}} ^{\frac{\pi}{\mathrm{4}}} \frac{\mathrm{1}}{\mathrm{cos}\:^{\mathrm{2}{n}+\mathrm{1}} {x}}{dx} \\ $$$${Prove}\:{by}\:{parts}\:{that}: \\ $$$$\mathrm{2}{nI}_{{n}} =\left(\mathrm{2}{n}−\mathrm{1}\right){I}_{{n}−\mathrm{1}} +\frac{\mathrm{2}^{{n}} }{\:\sqrt{\mathrm{2}}} \\ $$

Question Number 167739 Answers: 4 Comments: 2

Question Number 167738 Answers: 2 Comments: 0

72 → 49 42 → 16 21 → 2 16 → ?

$$\mathrm{72}\:\:\:\rightarrow\:\:\:\mathrm{49} \\ $$$$\mathrm{42}\:\:\:\rightarrow\:\:\:\mathrm{16} \\ $$$$\mathrm{21}\:\:\:\rightarrow\:\:\:\mathrm{2} \\ $$$$\mathrm{16}\:\:\:\rightarrow\:\:\:? \\ $$

Question Number 167737 Answers: 1 Comments: 0

3 □ 4 → 27 4 □ 2 → 36 2 □ 7 → 18 1 □ 9 → ?

$$\mathrm{3}\:\:\:\Box\:\:\:\mathrm{4}\:\:\:\rightarrow\:\:\:\mathrm{27} \\ $$$$\mathrm{4}\:\:\:\Box\:\:\:\mathrm{2}\:\:\:\rightarrow\:\:\:\mathrm{36} \\ $$$$\mathrm{2}\:\:\:\Box\:\:\:\mathrm{7}\:\:\:\rightarrow\:\:\:\mathrm{18} \\ $$$$\mathrm{1}\:\:\:\Box\:\:\:\mathrm{9}\:\:\:\rightarrow\:\:\:? \\ $$

Question Number 167730 Answers: 1 Comments: 2

Question Number 167772 Answers: 1 Comments: 2

x+(√x)=5 x+(5/( (√x)))=?

$${x}+\sqrt{{x}}=\mathrm{5} \\ $$$${x}+\frac{\mathrm{5}}{\:\sqrt{{x}}}=? \\ $$

Question Number 167750 Answers: 1 Comments: 0

Question Number 167725 Answers: 1 Comments: 4

Q#167612 reposted. Determine all the possible triples (a,b,c) of positive integers for which ab−c,bc−a and ca−b are powers of 2.

$${Q}#\mathrm{167612}\:{reposted}. \\ $$$$\mathcal{D}{etermine}\:{all}\:{the}\:{possible}\:{triples} \\ $$$$\left({a},{b},{c}\right)\:{of}\:{positive}\:{integers}\:{for}\:{which} \\ $$$${ab}−{c},{bc}−{a}\:{and}\:{ca}−{b}\:{are}\:{powers}\:{of} \\ $$$$\mathrm{2}. \\ $$

Question Number 167722 Answers: 1 Comments: 1

(2/Z) = (1/a)+(1/b) Z = ??? help

$$\frac{\mathrm{2}}{\boldsymbol{\mathrm{Z}}}\:=\:\frac{\mathrm{1}}{\boldsymbol{\mathrm{a}}}+\frac{\mathrm{1}}{\boldsymbol{\mathrm{b}}} \\ $$$$\boldsymbol{\mathrm{Z}}\:=\:???\:{help} \\ $$

Question Number 167718 Answers: 0 Comments: 2

(x−3)^2 +(y−5)^2 +(z−4)^2 =0 (x^2 /9)+(y^2 /(25))+(z^2 /(16))=? help me

$$\left({x}−\mathrm{3}\right)^{\mathrm{2}} +\left({y}−\mathrm{5}\right)^{\mathrm{2}} +\left({z}−\mathrm{4}\right)^{\mathrm{2}} =\mathrm{0} \\ $$$$\frac{{x}^{\mathrm{2}} }{\mathrm{9}}+\frac{{y}^{\mathrm{2}} }{\mathrm{25}}+\frac{{z}^{\mathrm{2}} }{\mathrm{16}}=? \\ $$$${help}\:{me} \\ $$

Question Number 167716 Answers: 1 Comments: 0

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