In question no.8c : ii.show that tan2B-1/cos2 B=-1. Share with your friends Share 0 Shruti Tyagi answered this 0 View Full Answer Arpita Shukla answered this tan 2b - 1/cos 2b = -1 L.H.S (20/15)2 - 1/(15/25)2 (the numbers have come from solving the first part of the question ) 16/9 - 25/9 -9/9 -1 L.H.S = R.H.S HENCE PROVED i think you are satisfied with this answer. THANKYOU. 1
