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- $ (\\\int {f(x)\\\;dx} )' = f(x),\\\;\\\forall x \\\in K.$
- $ \\\int {F(x)dx = f(x) + C,\\\;C \\\in K.}$
- $ (F(x))' = f(x),\\\;\\\forall x \\\in K.$
- $ \\\int {f(x)dx = F(x) + C,\\\;C \\\in K.}$