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Differentiate cos^(-1)(2x^2-1) with resp...

Differentiate `cos^(-1)(2x^2-1)` with respect to `x ,` if `0

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y=`cos^(-1)(2x^2-1)`
x=`costheta`
y=`cos^(-1)(2(costheta)^2-1)`
=`2theta`
=`pi < 2theta < 2pi`
u=`2pi-2theta`
...
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