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    wazhma1991's Avatar
    wazhma1991 Posts: 8, Reputation: 1
    New Member
    		  
    #1

    Mar 22, 2009, 05:12 AM
    trigonometry qusetion
    3sin3x=6sin3xcos3x
    is it ture

    3/4sin3A/2=3/2sin3A/4-cos3A/4
    how you solved:confused:
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
    Ultra Member
    		  
    #2

    Mar 22, 2009, 08:49 AM
    Look at the right side.

    Recognize the identity

    You have



    Is it true or false?
    wazhma1991's Avatar
    wazhma1991 Posts: 8, Reputation: 1
    New Member
    		  
    #3

    Mar 23, 2009, 05:56 AM

    Thanks galactus you are right can you solve anther qusetion to
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