Question

Buktikan identitas trigonometri: sin 2a/1+cos 2a=tan a

Answer 1

Sin2a / (1 + cos 2a)
= (2 sin a cos a) / (1 + 2cos^2 a - 1)
= (2 sin a cos a) / 2(cos a)^2
= sin a / cos a
= tan a