Use this function to show that 1+(1/3^2)+(1/5^2)+...=pi^2/8   f(x)=.5-(Summation from

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Use this function to show that 1+(1/3^2)+(1/5^2)+...=pi^2/8

 

f(x)=.5-(Summation from n=0 to infinity[(4cos((2n-1)(pi)(x)))/(pi^2*(2n-1)^2)]

 

or probably more useful

it's problem 18 on this pdf https://www.stewartcalculus.com/data/CALCULUS%206E%20Early%20Transcendentals/upfiles/topics/6et_at_01_fs_stu.pdf

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