A) 1
B) 2
C) 3
D) 4
E) many
Correct Answer: D
Solution :
\[\cos \theta +2\sin \theta \cos \theta =0\] \[\Rightarrow \] \[\cos \theta (1+2\sin \theta )=00\] \[\Rightarrow \] \[\cos \theta =0\]or \[\sin \theta =-\frac{1}{2}\] \[\therefore \]The number of values of \[\theta \] in the interval\[[-\pi ,\pi ]\]satisfying the given equation is 4.You need to login to perform this action.
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