Question

Question #fb742

Answer 1

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`