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c o t (\tan^{- 1} \frac{a}{b}) + \tan (c o t^{- 1} \frac{a}{b})

এর মান কত?

\frac{a}{b}

\frac{b}{a}

\frac{a}{b}

\frac{2 b}{a}

\frac{a^{2} + b^{2}}{b}

ANS : 4

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