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Math Help - sketching graphs

  1. #1
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    sketching graphs

    Hi guys, just having few problems sketching

    f(x) = sin(2x)

    i basically did a table

    x -2 -1 0 1 2
    y

    and input the x values into the equation to get a y value but then i try graph it on "GraphFunc online" and it gives me different y values for the same x values. Any ideas? i know what a sin sketch looks like but then i dont know how to include the 2x etc .....
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  2. #2
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    Quote Originally Posted by jvignacio View Post
    Hi guys, just having few problems sketching

    f(x) = sin(2x)

    i basically did a table

    x -2 -1 0 1 2
    y

    and input the x values into the equation to get a y value but then i try graph it on "GraphFunc online" and it gives me different y values for the same x values. Any ideas? i know what a sin sketch looks like but then i dont know how to include the 2x etc .....
    The period of y = sin(kx) is \frac{2 \pi}{k}. In your case k = 2 so the period is \pi. The graph of y = sin x is therefore dilated by a factor of 1/2 in the horizontal direction.

    If you're using a table of values to assist your sketching efforts, you should use values of x such as -pi/2, -pi/4, 0, pi/4, pi/2 rather than the values you have chosen ....
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