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যদি

\sin α + \sin β = a

এবং

\cos α + \cos β = b

হয়, তাহলে

\cos (α - β)

এর মান কত

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

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

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

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

ANS : 2

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