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AP EAMCET2008MathematicsTrigonometric Ratios & Identities

3 cosec 20^ - 20^ is equal to

Options

  1. A2
  2. B2 20^ cosec 40^
  3. C4
  4. D4 20^ cosec 40^

Correct answer

C. 4

Step-by-step solution

aligned & 3 cosec 20^ - 20^ &= 60^ 20^ - 1 20^ &= 60^ 20^ - 20^ 60^ 60^ 20^ 20^ &= 40^ 60^ 20^ 20^ &= 2 20^ 20^ 1 2 ( 20^ 20^ ) =4 aligned

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