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tanA = x হলে sec2A এর মান কত ?

\frac{1 - x^{2}}{1 + x^{2}}

\frac{1 + x^{2}}{1 - x^{2}}

\frac{1 - x^{2}}{2 x}

\frac{2 x}{1 - x^{2}}

ANS : 2

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