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Posted by on Tuesday, March 1, 2011 at 5:23pm.

Use Trig identities to verify that sec^4(x)-tan^4(x)=1+2tan^2(x), Only work with one side of the equation

  • Trig - , Wednesday, March 2, 2011 at 6:25am

    sec^4(x) - tan^4(x) =
    = (1 + tan^2(x))^2 - tan^4(x)
    = 1 + 2tan^2(x) + tan^4(x) - tan^4(x)
    = 1 + 2tan^2(x)

    QED

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