1.

The smallest positive angle which satisfies the equation \[2{{\sin }^{2}}\theta +\sqrt{3}\cos \theta +1=0\], is [ISM Dhanbad 1972; MP PET 1993]

A. \[\frac{5\pi }{6}\]
B. \[\frac{2\pi }{3}\]
C. \[\frac{\pi }{3}\]
D. \[\frac{\pi }{6}\]
Answer» B. \[\frac{2\pi }{3}\]


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