If y=secx, dy/dx=secxtanx (PDF Download) Oct 15, 2017 10:59:08 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Tiago on Oct 15, 2017 10:59:08 GMT If y=secx, dy/dx=secxtanx (PDF Download)If ysecx dy_dxsecxtanx _ Maths Proofs Video....pdf (113.67 KB)