[Toán 12] Tính tích phân

H

hocsinh345

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V

vivietnam

1,$\int \dfrac{sinxdx}{cosx}=\int \dfrac{-d(cosx)}{cosx}=-ln|cosx|+C $
2,Đặt $ x=cos2t $
3,$ \int (x^2-2+\dfrac{4}{x^2+2})dx=\dfrac{x^3}{3}-2x +\dfrac{4}{\sqrt{2}}arctan(\dfrac{x}{\sqrt{2}})+C$
4,Đặt $\sqrt{x+1}=t ;dx=2tdt$
$\int \dfrac{2tdt}{1+t}=....$
 
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