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if f(x)=x^3+5x, then f'(2)=

if f(x)=cos(2x), then f'(pi/4)

derivatives and anti derivatives

please help

  • Math-Derivitives -

    put in x=2

    d (cos2x)/dx=-2sin2x

    You need to examine why these are causing you difficulty,they are very elementary questions.

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