PreCalc

How do I verify that the following equations is an identity: 1+ sec x sin x tan x = sec^2 x

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asked by Glen
  1. First change sec x sin x tan x to (sinx/cosx)*tanx
    = tan^2 x
    So you have
    1 + tan^2 x = sec^2 x
    You can write the left side as
    (cos^2 x + sin^2 x)/cos^2 x = 1/cos^2 x = sec^2 x

    That completes the proof

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    posted by drwls
  2. Thank you!

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    posted by Glen

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