1.

Prove that (cos 7x + cos 5x /sin 7x - sin5x) = cot x

Answer»

cos7x+cos5x = 2cos6xcosx sin7x-sin5x = 2cos6xsinx (cos7x+cos5x)/(sin7x-sin5x) = 2cos6xcosx/2cos6xsinx = cotx



Discussion

No Comment Found