Question

Sin(A+120) =?

Answer 1

`rarrsin(A+120)=(sqrt(3)cosA-sinA)/2`

Explanation:

`rarrsin(A+120^@)`

`=sin(180^@-(60^@-A))`

`=sin(60^@-A)`

`=sin60^@*cosA-cos60^@*sinA`

`=sqrt(3)/2cosA-1/2sinA`

`=(sqrt(3)cosA-sinA)/2`