tan(A+B) derivation in terms of tan(A) and tan(B) [video] Oct 1, 2017 21:24:35 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Tiago on Oct 1, 2017 21:24:35 GMT Find out how to come up with the formula for tan(A+B), in terms of tan(A) and tan(B), from absolute scratch. Just watch the video below. Feel free to post questions, comments and feedback.