Question

show that one by cos theta minus cos theta is equals to 10 theta into sin theta

Answer 1

Hope it will help you

Answer 2

θ =A

$\frac{1}{cos A} - cos A$

$=\frac{1-cos^{2}A}{cos A}$

sin²θ + cos²θ = 1

$=\frac{sin^{2}A}{cos A}$

$=\frac{sin A}{cos A} sin A$

$=tan A sin A= RHS$

HENCE PROVED