A) 1
B) -1
C) 0
D) None of these
Correct Answer: A
Solution :
[a] \[\begin{align} & y=co{{s}^{-1}}\left[ \frac{5}{13}\cos x-\frac{12}{13}\sin x \right] \\ & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\downarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\downarrow \\ & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\cos \alpha \,\,\,\,\,\,\,\,\,\,\,\,\,\,\sin \alpha \\ \end{align}\] \[=co{{s}^{-1}}\left[ cos\left( x+\alpha \right) \right]\] \[y=x+\alpha \text{ }y'=1\]
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