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Question

যদি sinx + siny = a এবং cosx + cosy = b হয়, তবে দেখাও যে,

\sin \frac{1}{2} (x - y) = \pm \frac{1}{2} \sqrt{4 - a^{2} - b^{2}}

\sin \frac{1}{2} (x - y) = \pm \frac{1}{2} \sqrt{4 - a^{2} - b^{2}}

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