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Math Help - Trig

  1. #1
    Member srirahulan's Avatar
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    Arrow Trig

    If cos2A=\frac{3cos2B-1}{3-cos2B}Then prove tanA=\sqrt{2}tanB Plz Help me.
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  2. #2
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    Re: Trig

    hint: apply this formula cos(2x) = (1-tanx^2)/(1+tanx^2)
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