Question

if 2 cos theta = root 3 prove that 3 sin theta -4 sin^3 theta =1​

Answer 1

Step-by-step explanation:

alternative

cos Theta=√3/2

we know that cos 30°=√3/2

so, theta=30°

now, sin30°=1/2

so, LHS= 3(1/2)-4(1/2)^3

=3/2-4(1/8)

=3/2-1/2

=2/2

=1 =RHS

Hence, proved