The period of 2 sin x cos x is  Choose the correct answer:
A) 4 pi 2
B) 2 pi
C) 4 pi
D) pi
E) None
Solution   According to trigonometric identities, 2 sin x cos x = sin(2x) and the period is given by.   2 pi / 2 = pi   Answer pi
<result>D</result>
The period of 2 sin x cos x is