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    khearts11's Avatar
    khearts11 Posts: 1, Reputation: 1
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    #1

    Nov 15, 2009, 09:25 PM
    proving given identitis
    How would you solve:

    cot A (secA-cosA)=sinA
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Nov 15, 2009, 11:50 PM

    1. Substitute everything by functions in cos and sin.

    That gives:



    Now expand. All should be easy then.
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