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

    Aug 17, 2013, 07:18 AM
    Prove that
    cos(180-x)=-cosx
    teacherjenn4's Avatar
    teacherjenn4 Posts: 4,005, Reputation: 468
    Education Expert
    		  
    #2

    Aug 17, 2013, 08:22 AM
    We don't do homework here. Post your answer and someone will come along to help you.
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