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Homework Statement
Prove
Homework Equations
(π^3)/12≤∫_0^(π/2)▒〖(4x^2)/(2sinx) dx≥(π^3)/6〗
Also look at atachment
The Attempt at a Solution
I can't get round this one, since when you substitute x by 0 is always 0 and I don't know how to get ∏^3/12
Homework Statement
Homework Equations
The Attempt at a Solution
Attachments

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