Prove the trig identity: 1+tan^2 = sec^2
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`sec^(2)2x=1-tan2x`
Prove: 1 + tan^2theta = sec^2theta | Trigonometric Identities | Class 10 Maths
If sec theta =x+1/4x then prove that sec theta +tan theta =2x or 1/2x. trigonometry 10th
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Prove that `(sec 8theta-1)/(sec 4 theta -1) = (tan 8theta)/(tan 2theta)`
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