Question

Cos theta Root over 1 - cos square theta​

Answer 1

`{ \bf{ \cos \theta \sqrt{1 - { \cos }^(2) \theta } }} \\ { \sf{ = \cos \theta \sqrt{ { \sin }^(2) \theta} }} \\ { \sf{ = \cos \theta \sin \theta }} \\ { \sf{ = (1)/(2) \sin(2 \theta) }}`