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Math Help - Need help with 2 trigo questions

  1. #1
    Newbie
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    Jun 2009
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    Need help with 2 trigo questions

    Hi guys,

    the first question is :

    Find the time when I = 20sin(0.2(π)(t)+ π/3) is maximum : 0 ≤ t ≤ 12

    and the second one is :

    how to find I from the graph when t is given
    I = 4sin100t + 3cos100t

    for the second question what I did was, I made a table, assumed values from -5 to 5 and graphed, but I didn't know how to find I.

    Any help would be greatly appreciated, I have a exam and am stuck with these 2 questions.
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  2. #2
    Super Member malaygoel's Avatar
    Joined
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    India
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    Quote Originally Posted by jayjay View Post
    Hi guys,

    the first question is :

    Find the time when I = 20sin(0.2(π)(t)+ π/3) is maximum : 0 ≤ t ≤ 12
    sine function has maximum value when angle equals \frac{\pi}{2}

    0.2{\pi}t+\frac{\pi}{3}=\frac{\pi}{2}
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