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If f(x)=cos^(-1)(4x^3-3x)and lim(xto1//2...

If `f(x)=cos^(-1)(4x^3-3x)and lim_(xto1//2+)f'(x)=a and lim_(xto1//2-)f'(x)=b` then a + b+ 3 is equal to

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