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4 years ago

What is the slope of the equation 5/4x-7/4

Mathematics

1 answer:

romanna [79]4 years ago

3 0

Is this in slope intercept form?
DO you mean y=5/4x-7/4? If so then the slope is 5/4

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salantis [7]

$\textbf{Answer:}$

$\medskip\newline{\int\limits_{0}^{\infty}{\bigl(\frac{1}{y^2+1}\bigr)tan^{-1}(x)\mid_{x=0}^{x=\infty}}dy=\frac{\pi^2}{4}}$

$\medskip\newline\textbf{Step-by-step explanation:}$

$\medskip\newline\text{It's been a very long time since I've seen a calculus question.}\newline{\text{It might be because I haven't visited this site in a while.}}$ $\text{Anyway, on to the answer.}$

$\medskip\newline\text{When doing 2 integrals, work inside to out and treat the variables}\newline\text{ that aren't the ones being integrated as constants and proceed like normal.}$ $\medskip\medskip\newline\int\limits_{0}^{\infty}{\int\limits_{0}^{\infty}{\frac{1}{(x^2+1)(y^2+1)}}dx}dy$

$\newline{\text{Work inner to outer. Therefore, treat all y's as constants for now.}}$ $\newline{\text{By the integration formula: }\int\frac{1}{x^2+a^2}dx=\frac{1}{a}tan^{-1}(\frac{x}{a})+C}$

$\newline{\int\limits_{0}^{\infty}{\int\limits_{0}^{\infty}{\frac{1}{(x^2+1)(y^2+1)}}dx}dy=}$

$\newline{\int\limits_{0}^{\infty}{\bigl(\frac{1}{y^2+1}\bigr)tan^{-1}(x)\mid\limits_{x=0}^{x=\infty}}dy=}$

$\newline{\int\limits_{0}^{\infty}{\bigl(\frac{1}{y^2+1}\bigr)(tan^{-1}(\infty)-tan^{-1}(0))}dy=}$

$\newline{\int\limits_{0}^{\infty}{\bigl(\frac{1}{y^2+1}\bigr)(\frac{\pi}{2}-0)}dy=}$

$\newline{\int\limits_{0}^{\infty}{\bigl(\frac{1}{y^2+1}\bigr)(\frac{\pi}{2})}dy}$

$\medskip\newline\text{Using the same integration formula as before.}$

$\medskip\newline{\int\limits_{0}^{\infty}{\bigl(\frac{1}{y^2+1}\bigr)(\frac{\pi}{2})}dy=}$

$\newline{(\frac{\pi}{2})tan^{-1}(y)\mid\limits_{y=0}^{y=\infty}=}$

$\newline{(\frac{\pi}{2})(tan^{-1}(\infty)-tan^{-1}(0))=}$

$\newline{(\frac{\pi}{2})(\frac{\pi}{2}-0)=}$

$\newline{(\frac{\pi}{2})(\frac{\pi}{2})=}$

$\newline{\frac{\pi^2}{4}}$

$\bigskip\newline{\text{Therefore, the answer is }\frac{\pi^2}{4}}$

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3 years ago