📐Trigonometric Identities PROOF problem ! ! ! ! !

_______________
In this video tutorial you will learn how to show and verify the given Trigonometric Identity by using other well-known identities.

Verify the given Trigonometric Identities:

(a) sin(x + y) / [cos(x) cos(y)] = tan(x) + tan(y)
(b) 2tan(x) / sin(2x) = sec^2x
(c) [cos(2θ) + 1] / sin(2θ) = cot(θ) _________________________________