tanA=ntanB and sinA=msinB P.T cos2A=m2-1/n2-1 Share with your friends Share 2 Brijendra P. answered this Please follow the given link : https://www.meritnation.com/ask-answer/question/if-m-sina-sinb-n-tana-tanb-then-cos2a-m2-1-n2-1/introduction-to-trigonometry/1013887 1 View Full Answer
