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NDA Math Trigonometric Ratios of Angles and Equations Part 2

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DIRECTIONS (Qs. 19-21) : Read the following information and answer the three items that follow:
Let tn=sinnθ+cosnθ

[NDA-I 2020]

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Question : 56

Total: 75

What is t12−t2 equal to?

cos‌2‌θ
sin‌2‌θ
2‌cos‌θ
2‌sin‌θ

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