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1/sinx - (sinx)^2/sinx
= 1 - (sinx)^2 / sinx
= (cosx)^2 / sinx
that is equal to cosx/tanx
tanx = sinx/cosx
cosx/(sinx/cosx)
= (cosx)^2 / sinx
it's because the volume of a disc is pi r^2 and the radius is the upper y - the lower y and 1/x^2 - 0 = 1/x^2
∫ x = 1 to 4 pi(1/x^2)^2 dx
fg = m x g in the y direction.. unless i'm wrong idk
after long division it becomes
(1/2)x^2(ln(x+1)) - (1/2)[∫x-1 dx + ∫(1/(x+1)) dx
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