Verify (cos x + cos y) /(sin x - sin y) + (sin x + sin y) /(cos x - cos y) = 0

In this video, we will learn to prove the trigonometry identity (cos x + cos y) /(sin x - sin y) + (sin x + sin y) /(cos x - cos y) = 0.

Other topics of this video are:
Prove (cos x + cos y) /(sin x - sin y) + (sin x + sin y) /(cos x - cos y) = 0
To prove the equation (cos x + cos y) /(sin x - sin y) + (sin x + sin y) /(cos x - cos y) = 0

I, Ravi Ranjan Kumar Singh, have produced this video. All credits of this video go to me.