Let sin2x be a primitive function of F (x), and find ∫ f (x) DX

Sin2x is a primitive function of F (x)
So ∫ f (x) DX = sin2x + C
Definite integral is to find the set of original functions, ∫ f (x) DX means to find the set of original functions of F (x)
Sin2x is a primitive function of F (x). Adding sin2x to any constant C is the primitive function of F (x)

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