UPSC CDS Math Trigonometric Ratios and Trigonometric Identities Questions
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If 0 < 0 < 90°, sin θ =
= cot θ 1 + 3 x + 9 x 2 + 27 x 3 + 81 x 4 + 243 x 3 ?
[2019 CDS-II]
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