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99 Percentile Qs Bank for JEE MainMathematicsTrigonometric Ratios & Identities

1 - 2 c o s 60 o - c o s 80 o 2 s i n 10 o = ….

Options

  1. A2
  2. B1
  3. C1 2
  4. D3 2

Correct answer

B. 1

Step-by-step solution

We have, 1 - 2 c o s 60 o - c o s 80 o 2 s i n 10 o = 1 - 2 1 2 - c o s 80 o 2 s i n 10 o = 2 c o s 80 o 2 s i n 10 o = cos ⁡ 90 o - 10 o s i n 10 o = s i n 10 o s i n 10 o = 1

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