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    Trigonometric identities




    1. sec x - sin x tan x

    Verify that each equation is an identity.

    1. tan^2 x - sin^2 x = (tan x sin x)^2


    Solution Preview

    sec(x) - sin(x). tan(x)
    = 1/cos(x) - sin(x).sin(x)/cos(x)
    = {1 - sin^2(x)}/cos(x)
    = cos^2(x)/cos(x) = cos(x) ...

    Solution Summary

    This shows how to graph and verify trigonometric identities.