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Hannah_Ahn

Prove the identity \[\left( \sin2x \over 1+\cos2x \right) = \left( \sec ^{2}x-1 \over \tan x \right)\]

  • 2 years ago
  • 2 years ago

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  1. Yifan12879
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    use sin2x=2sinxcosx cos2x=2cos^2 x -1 sec^2 x -1 =tan^2 x then LHS=tanx=RHS

    • 2 years ago
  2. Hannah_Ahn
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    how did you get tan^2x

    • 2 years ago
  3. Hannah_Ahn
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    I got Left side : sinx over cosx-1 Right side : (1over cosx-1) over sinx ...?

    • 2 years ago
  4. Yifan12879
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    |dw:1325728083428:dw|

    • 2 years ago
  5. Hannah_Ahn
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    THANKS!!!! :) :)

    • 2 years ago
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