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    brittnicole's Avatar
    brittnicole Posts: 1, Reputation: 1
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    #1

    Mar 16, 2009, 12:01 PM
    Verifying Trig Identities
    secx-tanx=cosx/1+sinx
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 16, 2009, 12:14 PM

    It's almost always best to start by subbing the basic sin and cosine terms in for the secant and tangent terms. Then multiply both sides by the denominator on the right (1 + sinx) and see what you get.
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    vitaminh Posts: 3, Reputation: 1
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    #3

    Mar 21, 2009, 07:18 AM
    If the rhs is cosx/(1+sinx) then yes: rewrite lhs using cos and sin, massage and use 1-sinx*sinx = (1+sinx)(1-sinx) = cosx*cosx, massage again et voilą.
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