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যদি

\cos x + \cos y = a

\sin x + \sin y = b

\cos (x + y)

এর মান কোনটি?

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

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

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

\frac{a^{3} + 1 b^{2}}{a^{3} - b^{2}}

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

ANS : 2

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