If \[y={{\cos }^{-1}}\left( \frac{3\cos x+4\sin x}{5} \right)\], then \[\frac{dy}{dx}=\]

If \[y={{\cos }^{-1}}\left( \frac{3\cos x+4\sin x}{5} \right)\], then

1.	If \[y={{\cos }^{-1}}\left( \frac{3\cos x+4\sin x}{5} \right)\], then \[\frac{dy}{dx}=\]
A.	0
B.	1
C.	\[-1\]
D.	\[\frac{1}{2}\]
Answer» C. \[-1\]

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If \[y={{\cos }^{-1}}\left( \frac{3\cos x+4\sin x}{5} \right)\], then \[\frac{dy}{dx}=\]

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