If cotx.coty=2 then prove that- cos(x+y)/cos(x-y) =1/3 Share with your friends Share 1 Brijendra Pal answered this Hi, Refer the almost same link: https://www.meritnation.com/ask-answer/question/if-cotacotb-2show-that-cos-a-b-cos-a-b-1-3/math/2646734 1 View Full Answer