If cos x + cos y = 2, the value of sin x + sin y is

Home » Aptitude » Trigonometry » Question

cosx + cosy = 2
∵ cos x < 1
⇒ cos x = 1; cosy = 1
⇒ x = y = 0° [∵ Cos 0° = 1]
∴ sin x + sin y = 0