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6 August, 18:20

The equation sec2x - 1 = tan2x is an identity

O

O

A. True

B. False

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Answers (1)
  1. 6 August, 18:33
    0
    A. True.

    Step-by-step explanation:

    I am assuming that it's

    sec^2 x - 1 = tan^2 x

    Now sec^2 x - 1 = 1 / cos^2 x - 1

    = (1 - cos^2 x) / cos^2 x

    But 1 - cos^2 x = sin^2 x

    so sec^2 x - 1 = sin^2 x / cos ^2 x

    = tan^2 x.
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