Question

if cos x =√3/2,then find the value of 3sin x -4sin cube x

Answer 1

 cos x= √3/2 
then 
x= 30°

Now 
=3 x sin 30°- 4sin³ 30°
=3 × 1/2 - 4 ( 1/2)³
=3/2 -4/8 
=1/2( 3-4/4)
= 1/2 (2)
= 1 ANs 

Answer 2

hope this helps you...