Mathematics9 sec 2 A−9 tan 2 A   is equal to

9 sec 2 A9 tan 2 A   is equal to


  1. A
    1
  2. B
    9
  3. C
    8
  4. D
    0 

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    Solution:

    Given expression is 9 sec 2 A9 tan 2 A  .
    We know the identity that, sec 2 θ tan 2 θ=1  .
    Therefore,
    9 sec 2 A9 tan 2 A=9( sec 2 A tan 2 A) 9 sec 2 A9 tan 2 A=9×1 9 sec 2 A9 tan 2 A=9  
    The value obtained is 9.
    Therefore, option (2) is correct.
     
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