Jawabanmu

2014-04-10T04:06:41+07:00
Tan^2x-sec^2x=sin^2x/cos^2x-1/cos^2x
=(sin^2x-1)/cos^x........ingat"sin^2x+cos^2x=1
=(sin^2x-(sin^2x+cos^2x))/cos^2x
=1
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