Question

To prove: sina-2 sin^3a/2 cos^3a-cosa=tana

Answer 1

HEY DUDE PLS MARK BRAINLIEST

Answer 2

$\frac{sina - 2 {sin}^{3} a}{2 {cos}^{3} a - cosa} \\ \\ = \frac{sina(1 - 2 {sin}^{2} a)}{cosa(2 {cos}^{2}a - 1) } \\ \\ = \frac{sina(cos2a)}{cosa(cos2a)} \\ \\ = \frac{sina}{cosa} \\ \\ = tana$