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যদি

\cos α + \cos β = a, \sin α - \sin β = b

α - β = 2 θ

\frac{\cos 3 θ}{\cos θ}

এর মান?

a^{2} + b^{2} - 3

a^{2} - b^{2} + 3

3 - a^{2} + b^{2}

\frac{a^{3} + 3}{b^{2}}

a^{2} - 3 - b^{2}

ANS : 1

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