Question

evaluate sin (180)give reason also please

Answer 1

Sin (180) = sin (2*90°)
Let us take theta = 90°
Now, according to the formula

sin 2 theta= 2* sin theta * cos theta
By putting the value of theta=90°

sin (2*90°) = 2*sin90*cos90
= 2*1*0 = 0

since sin 90° = 1
& cos 90° = 0

Therefore,
sin (2*90) = sin (180°) = 0

Hope this helps you !!