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    crmedina23's Avatar
    crmedina23 Posts: 3, Reputation: 1
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    #1

    May 12, 2012, 09:18 PM
    verify identity?
    2cotx/(cotx+tanx)=cos^2x
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    May 13, 2012, 06:46 PM
    Quote Originally Posted by crmedina23 View Post
    2cotx/(cotx+tanx)=cos^2x

    Actually I think the left hand side equals 2 cos^2x.

    Convert the cotx and tanx functions on the left hand side to their sine and cosine eqivalents. Then simplify the resulting fraction by multiplying numerator and denominator by cosx sinx. What do you get?
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