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    yadiraa4's Avatar
    yadiraa4 Posts: 3, Reputation: 1
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    #1

    Apr 29, 2012, 09:40 PM
    Trig Identity
    Prove the identity: cosxcotx+sinx=cscx
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    yadiraa4 Posts: 3, Reputation: 1
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    #2

    Apr 29, 2012, 09:41 PM
    Trig
    If cosx= -2/3 and pi/2, find the exact value of cos(pi/3-x)
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    yadiraa4 Posts: 3, Reputation: 1
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    #3

    Apr 29, 2012, 09:41 PM
    Trig
    Given cos x=2/3 and 3pi/2<x<2pi, find the exact value of cos2x?
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