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Find f'(x) if f(x) = cos^(-1) ( 4x^3 - 3...

Find `f'(x)` if `f(x) = cos^(-1) ( 4x^3 - 3x)`.

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The correct Answer is:
Therefore, `f' (x) = 3 ((-1)/( sqrt(1 - x^2) ) = (-3)/( sqrt(1-x^2) )`
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