1
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

If $$\sin 2x = 4\cos x$$, then x is equal to

A
$${{n\pi } \over 2}\, \pm \,{\pi \over 4},n \in Z$$
B
no value
C
$$n\pi + {( - 1)^n}{\pi \over 4},n \in Z$$
D
$$2n\pi \, \pm \,{\pi \over 2},n \in Z$$
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

If $$\sin 3\theta = \sin \theta $$, how many solutions exist such that $$ - 2\pi < \theta < 2\pi $$?

A
9
B
8
C
7
D
5
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