prove that tan^2 theta ÷ tan^2 theta -1 + cos^2 theta ÷ sin^2 theta - cos^2 theta = 1 ÷ sin^2 theta - cos^2 theta
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LHS=tan^2theeta/sec^2theta+cos^2theta/-1
=sin^2theta/cos^2theta*cos^2theta/1-cos^2theta
=sin^2theta-cos^2theta
=-1
RHS
=1/-1
=-1
OK
=sin^2theta/cos^2theta*cos^2theta/1-cos^2theta
=sin^2theta-cos^2theta
=-1
RHS
=1/-1
=-1
OK
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