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

    Dec 8, 2010, 03:24 PM
    verify this trig equation
    (1-tan^2(45°-A))/(1+tan^2(45°-A))=sin2A
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 8, 2010, 03:35 PM

    Let B = (45-A), substitute sin(B)/cos(B) for tan(B), and the left hand side simplifies to:



    The numerator and denominator are now both well known trig identities - can you take it from here? And recall that
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