\(y=\dfrac{sinx+1}{sinx}\)
ĐKXĐ: \(sinx\ne0\Rightarrow x\ne k\pi\)
\(y=\dfrac{sin2x+cosx}{tanx-sinx}\)
ĐKXĐ: \(\left\{{}\begin{matrix}cosx\ne0\\tanx-sinx\ne0\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}cosx\ne0\\sinx\left(\dfrac{1}{cosx}-1\right)\ne0\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}cosx\ne0\\sinx\ne0\\cosx\ne1\end{matrix}\right.\)
\(\Rightarrow sin2x\ne0\)
\(\Rightarrow x\ne\dfrac{k\pi}{2}\)
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