3cosec⁡20∘−sec⁡20∘ is equal to

3cosec20sec20 is equal to

  1. A

    1

  2. B

    2

  3. C

    3

  4. D

    4

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    Solution:

    3cosec20sec20=3sin201cos20=3cos20sin20sin20cos20=432cos2012sin202sin20cos20=4sin60cos20cos60sin20sin40=4sin40sin40=4

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