Prove that sin 90 ° - A 1 - tan A + sin A 1 - tan 90 ° - A = cos A + cos 90 ° - A . Share with your friends Share 0 Sandeep Saurav answered this Dear Student, Hope this information will clear your doubts about topic. If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible. Keep posting!! Regards 0 View Full Answer