write ∫tan(x)dx=−∫−sin(x)cos(x)dx. and note that (cos(x))′=−sin(x). this integral is from the form ∫f′(x)f(x)dx. ... <看更多>
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write ∫tan(x)dx=−∫−sin(x)cos(x)dx. and note that (cos(x))′=−sin(x). this integral is from the form ∫f′(x)f(x)dx. ... <看更多>