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it will be same whether you substitute now or later

will writing this much suffice?

how much to elaborate?

yes it is 108Π

on assuming x=tan y, we get (1-x^{2})/(1+x^{2}) = cos 2y;

cos^{-1}(cos 2y)= 2y = 2tan^{-1} x;

hence integrate 2tan^{-1}x

2nd plane is 2.5y or 25y

EDIT: It is 2.5y

Answer : 1 unit

goddamnit it isnt working on any of my devices wtf

nothing is working, if i just type respaper.com and go, chrome says cannot connect

out of syllabus wtf

tanx + C