If y=tanx, dy/dx=(secx)^2 Oct 15, 2017 11:00:56 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Tiago on Oct 15, 2017 11:00:56 GMT If y=tanx, dy/dx=(secx)^2If ytanx dy_dxsecx2 _ Maths Proofs Videos ....pdf (127.2 KB)