What is the value of [(sin x + sin y)(sin x - sin y)] / [(cos x + cos y)(cos y - cos x)] ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 ie 1.
Putting x = 10°, y = 0°
= [(sin x + sin y)(sin x - sin y)] / [(cos x + cos y)(cos y - cos x)]
= (1 × 1)/(1 × 1)
= 1