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Questions  >>  Olympiad-Math  >>  Class 10
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Q)

If $\sec \theta + \tan \theta =m$ and $\sec \theta - \tan \theta =n$ then $mn $ =______

$\begin{array}{1 1}(A) \; 0 \\(B)\; 1 \\(C)\;2 \\(D)\;\sqrt 2 \end{array}$

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