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KCET2019MathematicsTrigonometric Ratios & Identities

( 3 cosec 20^ - 20^ = )

Options

  1. A( 03 )
  2. B( 11 )
  3. C( 12 )
  4. D( 04 )

Correct answer

D. ( 04 )

Step-by-step solution

(D) ( 3 cosec 20^ - 20^ ) ( = 3 20^ - 1 20^ = 3 20^ - 20^ 20^ 20^ = 2 [ 3 2 20^ - 1 2 20^ ] 1 2 [2 20^ 20^ ] ) ( =4 [ 60^ 20^ - 60^ 20^ ] 40^ =4 (60^ -20^ ) 40^ =4 40^ 40^ =4 )

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