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Trig Identities question?

Science & Mathematics by Anonymous 2018-05-25 11:05:44

Social Science

Trig Identities question?

3 answers

Prove that 1 + tan^2x = 1 / cos^2x

  • Anonymous

                                         

  • Anonymous

    Start with Pythagoras Theorem x^2+y^2 = r^2 x^2/r^2+y^2/r^2 = 1 cos^2(x)+sin^2(x) = 1 1+tan^2(x) = 1/cos^2(x) QED

  • Anonymous

    Identities tanx = sinx/cosx and (sinx)^2+(cosx)^2=1

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