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UPSC NDA II 2025 Mathematics Paper

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Question Numbers: 25-26
For the following two (02) items:
Let sin A + sin B = p and cos A + cos B = q

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Question : 26

Total: 120

What is ‌

equal to?

cos(A + B)
cos(A - B)
cos⁡(‌
π
2
−A−B)
cos(π−A−B)

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