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AllQuestion and Answers: Page 79

Question Number 215227    Answers: 2   Comments: 0

(20+25)^2 =2025 only 3 other 4 digit numbers: (00+01)^2 =0001 (30+25)^2 =3025 (98+01)^2 =9801

$$\left(\mathrm{20}+\mathrm{25}\right)^{\mathrm{2}} =\mathrm{2025} \\ $$$$\mathrm{only}\:\mathrm{3}\:\mathrm{other}\:\mathrm{4}\:\mathrm{digit}\:\mathrm{numbers}: \\ $$$$\left(\mathrm{00}+\mathrm{01}\right)^{\mathrm{2}} =\mathrm{0001} \\ $$$$\left(\mathrm{30}+\mathrm{25}\right)^{\mathrm{2}} =\mathrm{3025} \\ $$$$\left(\mathrm{98}+\mathrm{01}\right)^{\mathrm{2}} =\mathrm{9801} \\ $$

Question Number 215200    Answers: 4   Comments: 1

HAPPY NEW YEAR𝚺_(n=1) ^9 n^3 !

$$\boldsymbol{\mathcal{HAPPY}}\:\:\boldsymbol{\mathcal{NEW}}\:\:\boldsymbol{\mathcal{YEAR}}\underset{\boldsymbol{{n}}=\mathrm{1}} {\overset{\mathrm{9}} {\boldsymbol{\sum}}{n}}^{\mathrm{3}} \:! \\ $$

Question Number 215199    Answers: 0   Comments: 0

F(x ,y) = ln (√(x^2 +y^2 )) where x(r,s) = r e^s and y(r,s) = r e^(βˆ’s ) Find (a) (βˆ‚F/βˆ‚r) (b) (βˆ‚F/βˆ‚s)

$$\:\:\:\: \mathrm{F}\left(\mathrm{x}\:,\mathrm{y}\right)\:=\:\mathrm{ln}\:\sqrt{\mathrm{x}^{\mathrm{2}} +\mathrm{y}^{\mathrm{2}} }\: \\ $$$$\:\:\:\mathrm{where}\:\mathrm{x}\left(\mathrm{r},\mathrm{s}\right)\:=\:\mathrm{r}\:\mathrm{e}^{\mathrm{s}} \:\mathrm{and}\:\mathrm{y}\left(\mathrm{r},\mathrm{s}\right)\:=\:\mathrm{r}\:\mathrm{e}^{βˆ’\mathrm{s}\:} \\ $$$$\:\:\mathrm{Find}\: \\ $$$$\:\left(\mathrm{a}\right)\:\frac{\partial\mathrm{F}}{\partial\mathrm{r}}\:\:\:\:\: \\ $$$$\:\left(\mathrm{b}\right)\:\frac{\partial\mathrm{F}}{\partial\mathrm{s}} \\ $$

Question Number 215195    Answers: 1   Comments: 1

Question Number 215193    Answers: 2   Comments: 1

Question Number 215190    Answers: 1   Comments: 0

∫(x^(pβˆ’1) /(1+x^n ))lnln(1/x)dx,p,n>0

$$\int\frac{{x}^{{p}βˆ’\mathrm{1}} }{\mathrm{1}+{x}^{{n}} }\mathrm{lnln}\frac{\mathrm{1}}{{x}}{dx},{p},{n}>\mathrm{0} \\ $$

Question Number 215189    Answers: 1   Comments: 0

∫_0 ^∞ ((ln(1+x^(12) ))/(1+x^2 ))dx

$$\int_{\mathrm{0}} ^{\infty} \frac{\mathrm{ln}\left(\mathrm{1}+{x}^{\mathrm{12}} \right)}{\mathrm{1}+{x}^{\mathrm{2}} }{dx} \\ $$

Question Number 215188    Answers: 2   Comments: 0

∫_0 ^∞ ((x cos 2Ο€x)/(e^(2Ο€(√x)) βˆ’1))dx

$$\int_{\mathrm{0}} ^{\infty} \frac{{x}\:\mathrm{cos}\:\mathrm{2}\pi{x}}{{e}^{\mathrm{2}\pi\sqrt{{x}}} βˆ’\mathrm{1}}{dx} \\ $$

Question Number 215185    Answers: 1   Comments: 0

∫_(βˆ’βˆž) ^∞ ((exp(((ax)/(1+x^2 )))exp((a/(1+x^2 ))))/(1+x^2 ))dx,a>0

$$\int_{βˆ’\infty} ^{\infty} \frac{\mathrm{exp}\left(\frac{{ax}}{\mathrm{1}+{x}^{\mathrm{2}} }\right)\mathrm{exp}\left(\frac{{a}}{\mathrm{1}+{x}^{\mathrm{2}} }\right)}{\mathrm{1}+{x}^{\mathrm{2}} }{dx},{a}>\mathrm{0} \\ $$

Question Number 215177    Answers: 2   Comments: 0

x^3 + x^2 + x = βˆ’ (1/3) Find the value of x ! Help me, please

$$ \\ $$$$\:\:\:{x}^{\mathrm{3}} \:+\:{x}^{\mathrm{2}} \:+\:{x}\:=\:βˆ’\:\frac{\mathrm{1}}{\mathrm{3}} \\ $$$$\:\:\:\mathcal{F}{ind}\:{the}\:{value}\:{of}\:\:{x}\:\:!\: \\ $$$$ \\ $$$$\:\:\:\mathcal{H}{elp}\:{me},\:\:{please} \\ $$$$ \\ $$

Question Number 215168    Answers: 1   Comments: 0

Let two roots of the equation x^2 +2mx+m^2 βˆ’2m+3=0 is Ξ±, Ξ²(For Ξ±<Ξ²), (2) Find (Ξ±βˆ’Ξ²)^2 Using m. (3) If Ξ²βˆ’Ξ±=2, Solve for m. If you donβ€²t solve it, I will force you to solve.

$$\mathrm{Let}\:\mathrm{two}\:\mathrm{roots}\:\mathrm{of}\:\mathrm{the}\:\mathrm{equation}\:{x}^{\mathrm{2}} +\mathrm{2}{mx}+{m}^{\mathrm{2}} βˆ’\mathrm{2}{m}+\mathrm{3}=\mathrm{0}\:\mathrm{is}\:\alpha,\:\beta\left(\mathrm{For}\:\alpha<\beta\right), \\ $$$$\left(\mathrm{2}\right)\:\mathrm{Find}\:\left(\alphaβˆ’\beta\right)^{\mathrm{2}} \:\mathrm{Using}\:{m}. \\ $$$$\left(\mathrm{3}\right)\:\mathrm{If}\:\betaβˆ’\alpha=\mathrm{2},\:\mathrm{Solve}\:\mathrm{for}\:{m}. \\ $$$$\mathrm{If}\:\mathrm{you}\:\mathrm{don}'\mathrm{t}\:\mathrm{solve}\:\mathrm{it},\:\mathrm{I}\:\mathrm{will}\:\mathrm{force}\:\mathrm{you}\:\mathrm{to}\:\mathrm{solve}. \\ $$

Question Number 215167    Answers: 1   Comments: 0

If the quadratic equation x^2 βˆ’2xβˆ’m+1=0 has two different positive real roots Ξ±, Ξ², Determine the range of m (For example, 0<m<3) or I will force you to determine

$$\mathrm{If}\:\mathrm{the}\:\mathrm{quadratic}\:\mathrm{equation}\:{x}^{\mathrm{2}} βˆ’\mathrm{2}{x}βˆ’{m}+\mathrm{1}=\mathrm{0}\:\mathrm{has}\:\mathrm{two}\:\mathrm{different}\:\mathrm{positive}\:\mathrm{real}\:\mathrm{roots}\:\alpha,\:\beta, \\ $$$$\mathrm{Determine}\:\mathrm{the}\:\mathrm{range}\:\mathrm{of}\:{m}\:\left(\mathrm{For}\:\mathrm{example},\:\mathrm{0}<{m}<\mathrm{3}\right)\:\mathrm{or}\:\mathrm{I}\:\mathrm{will}\:\mathrm{force}\:\mathrm{you}\:\mathrm{to}\:\mathrm{determine} \\ $$

Question Number 215166    Answers: 1   Comments: 0

If the quadratic equation 3x^2 +8x+2k=0 has two different negative real roots, Determine the range of k (For example, 0<k<3) or I will force you to determine

$$\mathrm{If}\:\mathrm{the}\:\mathrm{quadratic}\:\mathrm{equation}\:\mathrm{3}{x}^{\mathrm{2}} +\mathrm{8}{x}+\mathrm{2}{k}=\mathrm{0}\:\mathrm{has}\:\mathrm{two}\:\mathrm{different}\:\mathrm{negative}\:\mathrm{real}\:\mathrm{roots}, \\ $$$$\mathrm{Determine}\:\mathrm{the}\:\mathrm{range}\:\mathrm{of}\:{k}\:\left(\mathrm{For}\:\mathrm{example},\:\mathrm{0}<{k}<\mathrm{3}\right)\:\mathrm{or}\:\mathrm{I}\:\mathrm{will}\:\mathrm{force}\:\mathrm{you}\:\mathrm{to}\:\mathrm{determine} \\ $$

Question Number 215164    Answers: 1   Comments: 0

Let the two roots of the quadratic equation x^2 βˆ’12x+k=0 is Ξ±, Ξ±^2 , Then solve for Ξ± and k or I will force you to solve

$$\mathrm{Let}\:\mathrm{the}\:\mathrm{two}\:\mathrm{roots}\:\mathrm{of}\:\mathrm{the}\:\mathrm{quadratic}\:\mathrm{equation}\:{x}^{\mathrm{2}} βˆ’\mathrm{12}{x}+{k}=\mathrm{0}\:\mathrm{is}\:\alpha,\:\alpha^{\mathrm{2}} , \\ $$$$\mathrm{Then}\:\mathrm{solve}\:\mathrm{for}\:\alpha\:\mathrm{and}\:{k}\:\mathrm{or}\:\mathrm{I}\:\mathrm{will}\:\mathrm{force}\:\mathrm{you}\:\mathrm{to}\:\mathrm{solve} \\ $$

Question Number 215161    Answers: 1   Comments: 4

∫(((x^8 +16x^7 βˆ’2x^4 βˆ’3)e^x )/((1+x^4 )^(2/3) ))dx

$$ \\ $$$$\:\:\:\:\:\:\int\frac{\left({x}^{\mathrm{8}} +\mathrm{16}{x}^{\mathrm{7}} βˆ’\mathrm{2}{x}^{\mathrm{4}} βˆ’\mathrm{3}\right){e}^{{x}} }{\left(\mathrm{1}+{x}^{\mathrm{4}} \right)^{\mathrm{2}/\mathrm{3}} }{dx} \\ $$$$ \\ $$

Question Number 215147    Answers: 2   Comments: 0

Question Number 215141    Answers: 2   Comments: 0

Question Number 215137    Answers: 1   Comments: 0

If ab^(βˆ’) + ba^(βˆ’) = n^2 Find max(aβˆ™b) βˆ’ min(aβˆ™b) = ?

$$\mathrm{If}\:\:\:\overline {\mathrm{ab}}\:+\:\overline {\mathrm{ba}}\:=\:\mathrm{n}^{\mathrm{2}} \\ $$$$\mathrm{Find}\:\:\:\mathrm{max}\left(\mathrm{a}\centerdot\mathrm{b}\right)\:βˆ’\:\mathrm{min}\left(\mathrm{a}\centerdot\mathrm{b}\right)\:=\:? \\ $$

Question Number 215134    Answers: 2   Comments: 0

Question Number 215126    Answers: 1   Comments: 3

Question Number 215114    Answers: 1   Comments: 0

Question Number 215107    Answers: 0   Comments: 4

Question Number 215094    Answers: 1   Comments: 11

Question Number 215092    Answers: 1   Comments: 2

Question Number 215091    Answers: 1   Comments: 0

Ξ£_(n=0) ^∞ (βˆ’1)^n (( Ξ“^( 2) (n+1))/(Ξ“ (2n+1))) = ? βˆ’βˆ’βˆ’ Ξ² (p ,q ) = (( Ξ“ (p)Ξ“(q))/(Ξ“(p+q )))

$$ \\ $$$$\:\:\:\:\:\underset{{n}=\mathrm{0}} {\overset{\infty} {\sum}}\left(βˆ’\mathrm{1}\right)^{{n}} \:\frac{\:\Gamma^{\:\mathrm{2}} \left({n}+\mathrm{1}\right)}{\Gamma\:\left(\mathrm{2}{n}+\mathrm{1}\right)}\:=\:? \\ $$$$\:\:\:\:\:\:βˆ’βˆ’βˆ’ \\ $$$$\:\:\:\:\beta\:\left({p}\:,{q}\:\right)\:=\:\frac{\:\Gamma\:\left({p}\right)\Gamma\left({q}\right)}{\Gamma\left({p}+{q}\:\right)} \\ $$

Question Number 215089    Answers: 1   Comments: 0

log _2 x + log _3 (x+1) = 5 x = ?

$$\:\:\mathrm{log}\:_{\mathrm{2}} \:\mathrm{x}\:+\:\mathrm{log}\:_{\mathrm{3}} \:\left(\mathrm{x}+\mathrm{1}\right)\:=\:\mathrm{5}\: \\ $$$$\:\mathrm{x}\:=\:? \\ $$

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