Calculus problem: let a primitive function of F (x) be cos (2x), and find ∫ f '(x) DX Let a primitive function of F (x) be cos (2x), and find ∫ f '(x) DX

An original function of F (x) is cos (2x),
=> f(x)=cos'(2x)=-2sin(2x)
=> ∫f'(x)dx=f(x)+C=-2sin(2x)+C

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