(1 - cos²theta) sec square theta = tan square theta
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let theta=A
(1-cos^2A) sec^2A=tna^2A
RHS=
=sec^2A-Cos^2A×sec^2A
=1/cos^2A-cos^A×1/cos^2A
=1/cos^2A-1
=1-cos^2A/cos^2A
=sin^2A/cos^2A
=tan^2A
LHS=RHS
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