A) \[3\]
B) \[2\]
C) \[1\]
D) \[0\]
Correct Answer: A
Solution :
Given, \[\sin x=\sin 2x\] \[\Rightarrow \] \[\sin \,x=2\,\sin x\,\cos x\] \[\Rightarrow \] \[\sin x(1-2\,\cos x)=0\] \[\Rightarrow \] \[\sin x=0\] or \[\cos \,x=\frac{1}{2}\] \[\Rightarrow \] \[x={{0}^{o}}\] or \[x={{60}^{o,}}\,-{{60}^{o}}\] Hence, number of solution is 3.You need to login to perform this action.
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