A) \[x-y=1\]
B) \[x+y+1=0\]
C) \[x+2y=2\]
D) \[\tan (x+y=-\tan 7\]
Correct Answer: D
Solution :
\[x={{\cos }^{-1}}(cos4)\] \[={{\cos }^{-1}}(cos(2\pi -(2\pi -4))\] \[y={{\sin }^{-1}}(sin3)={{\sin }^{-1}}\sin (\pi -3)=\pi -3\] \[\therefore \] \[x+y=3\pi -7\] \[\therefore \] \[\tan (x+y)=-\tan 7\]You need to login to perform this action.
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