Question

2sin theta=1/2, prove that(3cos theta -4 cos^3 theta)=0​

Answer 1

Answer:

Step-by-step explanation:

sin∅=1/2

sin^2∅=1/4

3cos∅-4cos^3∅= cos∅(3-4cos^∅)                     cos^∅=(1-Sin^∅)

            =cos∅(3- 4((1-Sin^∅))

             =cos∅(3-4+4sin^∅)

              =cos∅(-1+(4x1/4))

            = cos∅(-1+1)= cos∅x0 =0

hence proved