If x=30° then verify that sin3x=3sin(x)-4sin3x
Verifying sin3x=3sin(x)-4sin3x for x=30°:
Taking L.H.S., we get,
sin3x=sin3×30°=sin90°=1
Taking R.H.S, we get,
3sin(x)-4sin3x=3sin(30°)-4sin330°=3×12-4×123(sin(30°)=12)=32-48=12-48=88=1
On comparing L.H.S and R.H.S. we get,
L.H.S.=R.H.S=1
Hence, sin3x=3sin(x)-4sin3x is verified.
If (i) , then verify that
(ii) , then verify that