Jawabanmu

2014-06-12T21:25:26+07:00
1-sin^2x= cos^2x
cos^2x.tan^2x
= cosx.cosx.sinx/cosx.sinx/cosx
=sinx.sinx=sin^2x

tan=sin/cos
1 5 1
2014-06-12T21:28:21+07:00
(1-sin^2)=cos^2
tan=sin/cos
jadi
cos^2x x tan ^2x=sin^2x