1 + tan2 = tan2 / sin2
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u can use google aslo
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LHS=1+tan^2=sec^2=1/cos^2
RHS=tan^2/sin^2=sin^2/cos^2/sin^2=1/cos^2
RHS=LHS
RHS=tan^2/sin^2=sin^2/cos^2/sin^2=1/cos^2
RHS=LHS
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