find the 2nd derivative of y= 1/x +cosxsinx I got 2/x^3

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Find the derivative of a)y=3x^2Cos 2x b)y=cot5x c)y=2x^3+4x^2-3x+5

FIND the first derivative of the following functions without necessarily using the first principle...

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1.find the second derivative of function F(*)=*-1

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