\(A....=\int\left(\dfrac{1}{sin^2x}+1\right)dx=-cotx+x+C\RightarrowĐúng\)
\(B....=\int\left(sin^2\dfrac{x}{2}\right)dx=\dfrac{1}{2}\int\left(1-cosx\right)dx=\dfrac{1}{2}\left(x-sinx\right)+C\Rightarrow Sai\)
\(C....=\int\left(1+2sin\dfrac{x}{2}cos\dfrac{x}{2}\right)dx=\int\left(1+sinx\right)dx=x-cosx+C\Rightarrow Sai\)
\(D....=\int\left(1-2sin\dfrac{x}{2}cos\dfrac{x}{2}\right)dx=\int\left(1-sinx\right)dx=x+cosx+C\Rightarrow Sai\)
Đúng 1
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