Prove that the value of \( (\sec \theta+\cos \theta)(\sec \theta-\cos \) \( \theta) \) is \( \ta...

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Prove that the value of \( (\sec \theta+\cos \theta)(\sec \theta-\cos \)
\( \theta) \) is \( \tan ^{2} \theta+\sin ^{2} \theta \).
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