Question

sin3A/1+2cos2A it's answer is sinA I need it's explanation ​

Answer 1

Answer:

sin(3A)/1+2cosa

3sin(A) - 4sin^3(A)/1+2(1-2sin2(A)

sin(A) (3-4 sin^2(A)/ (3-4 sin ^2(A)

sin(A) proof