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UPSC NDA I and II 2020 Math Solved Paper

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DIRECTIONS (Qs. 22-24) : Read the following information and answer the three items that follow:
Let α=β=15°

[NDA-I 2020]

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Question : 23

Total: 120

What is the value of sin‌7‌α−cos‌7‌β?

1
√2
1
2√2
√3
2√2
√3
√2

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