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    jake beggs's Avatar
    jake beggs Posts: 5, Reputation: 1
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    #1

    Dec 7, 2008, 04:23 PM
    verifying trigonometric equations
    I cannot solve these can anyone help?


    (sin(a+b))/(sin(a-b))=(tan(a)+tan(b))/(tan(a)-tan(b))



    sin(2X)-tan(x)=tan(x)cos(2x)
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 8, 2008, 08:57 AM

    Here are some hints:

    First one - simply change the tan(a) and tan(b) terms to their sin/cos equivalents, then simplify by multiplying through both the numerator and denominator by a common factor. You will need to know the identities for sin(a+b) and sin(a-b) to finish it out,

    For the second - again change tan to sin/cos, and replace the sin(2x) and cos(2x) bits by their equivalent sin and cos expressions.
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