1+sec^2 theta sin^2 theta=sec^2 theta
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1+sec^2 theta sin^2 theta=sec^2 theta
LHS
1+sec^2 theta sin^2 theta
tan^2 theta 1-cos^2 theta
sin^2 theta/cos^2 theta 1-cos^2 theta
sin^2 theta cos^2 theta-cos^2 theta
sin^2 theta
1/cos^2 theta
sec^2 theta
LHS=RHS
ANSWER:
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