1.

If \[y=\left| \begin{matrix}    \sin x & \cos x & \sin x  \\    \cos x & -\operatorname{sinx} & \cos x  \\    x & 1 & 1  \\ \end{matrix} \right|,\]then \[\frac{dy}{dx}\] is

A. \[1\]
B. \[2\]
C. \[3\]
D. 0
Answer» B. \[2\]


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