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$c o t α + c o t β = a, t a n β = b$ এবং $α + β = θ$ হলে $c o t θ$ কোনটি?

\frac{1}{b} - \frac{1}{a}

\frac{1}{a} - \frac{1}{b}

\frac{1}{a} + \frac{1}{b}

- \frac{1}{a} - \frac{1}{b}

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