trig

Establish the following identity: CosA/1-TanA + SinA/1-CotA = CosA-SinA

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asked by uche
  1. cosA/(1-tanA) + sinA/(1-cotA)
    cosA/(1-tanA) + sinAtanA/(tanA-1)
    (cosA - sinAtanA)/(1-tanA)
    (cos^2A-sin^2A) / cosA(1-tanA)
    (cos^2A-sin^2A)/(cosA-sinA)
    cosA+sinA

    sure you don't have a typo somewhere?

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    posted by Steve

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