Prove 1+tan^2theta=sec^2theta

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Prove 1+tan^2theta=sec^2theta. Prove 1+tan^2x=sec^2x,
prove 1+tan^2x=sec^2x using triangles,
prove that 1+tan 2 theta tan theta=sec 2 theta,
1+tan 2 theta tan theta=sec 2 theta,
1+tan^2 theta=sec^2 theta proof,
tan^(2)theta+sec 2 theta=1,
sec^2 theta=1-tan 2 theta,
2 tan theta/ 1+tan^2 theta,
1-tan^2 theta/1+tan^2 theta,
1 tan 2 theta equals,
1-tan^2 theta/cot^2 theta-1=tan^2 theta,
prove sec^2-tan^2=1,
tan^2 theta+1/tan^2 theta,
tan 2theta.
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if 1 + tan square theta equal to sec square theta can we used 1 + tan theta = sec theta in normal question coz i had a question in which tan A +1 WAS EQUAL TO UNDER ROOT 2 SO I JUST WROTE SEC THETA EQUALS TO UNDER ROOT 2

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