trig

express the trig. ratios sinA,secA n
tanA in terms of cotA.

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  1. tan A = 1/cotA

    1/cotA^2 = sin^2A/cos^2A
    = (1 - cos^2A)/cos^2A
    = [1/cos^2A] - 1

    1 + (1/cot^2A) = 1/cos^2A

    sec^2A = 1 + (1/cot^2A)

    The sign of secA will depend upon the quadrant A is in

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    posted by drwls

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