tan2x=? sin x=0,6 cos x= 0.8
tan2x = sin2x /cos2x = [2sinxcosx]/[cos^2x - sin^2x] = [2(.6)(.8)] / [ (.8)^2 -(.6)^2] = 2[.48]/[.28] = .96/.28 = .48/.14 = .24/.7 = 24/7
