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UPSC NDA I 2025 Mathematics Paper

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Question Numbers: 71-72
Let x= sec⁡θ−cos⁡θ‌ and ‌y= sec4⁡θ−cos4⁡θ‌

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Question : 71

Total: 120

What is (‌

)2 equal to?

‌
4(y2+4)
(x2+4)
‌
4(y2−4)
(x2−4)
‌
16(y2+4)
(x2+4)
‌
16(y2−4)
(x2−4)

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