ĐKXĐ: \(\left\{{}\begin{matrix}sinx\ne0\\sin\left(x-1\right)\ne0\\cos\left(x-1\right)\ne0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}sinx\ne0\\sin\left(2x-2\right)\ne0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x\ne k\pi\\x\ne1+\frac{k\pi}{2}\end{matrix}\right.\)