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Math Help - trig question

  1. #1
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    trig question

    I need help if any one has suggestions

    y=sin (3x+ pi/2)
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  2. #2
    MHF Contributor harish21's Avatar
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    Quote Originally Posted by besito2001 View Post
    I need help if any one has suggestions

    y=sin (3x+ pi/2)
    What exactly does your question ask??

    All I can tell is:

    sin(A+B) = sinA.cosB + cosA.sinB

    so if you substitute A=3x and B= \frac{\pi}{2},

    you have y=cos(3x)
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