Question #fb742

1 Answer
Sep 26, 2017

0

Explanation:

Using Formula
sin2theta=2sinthetacostheta

replace theta=90^@
sin2(90^@)=2sin(90^@)cos(90^@)
sin180^@=2sin(90^@)cos(90^@)=2(1)(0)=0

because cos90^@)=0 and sin90^@=1