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Math Help - please check trig work

  1. #1
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    please check trig work

    1. the period of the function y= cos3x in radians is 3 \pi

    2. the phase shift of the function y=3sin5( \theta - \frac{\pi}{4}) is \frac{\pi}{4}

    3. the vertical shift of the function y=3tan2(4 \theta - \frac{\pi}{2})+5 is 5

    4. the phase shift of the function y=5sin(2x+6)-7 is 7 units left
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  2. #2
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    Quote Originally Posted by william View Post

    3. the vertical shift of the function y=3tan2(4 \theta - \frac{\pi}{2})+5 is 5
    I agree, answers to 1,2 and 4 can be found from the thread

    http://www.mathhelpforum.com/math-he...rig-work2.html
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  3. #3
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    Quote Originally Posted by pickslides View Post
    I agree, answers to 1,2 and 4 can be found from the thread

    http://www.mathhelpforum.com/math-he...rig-work2.html
    thanks, but i'm still unclear on the phase shift because here http://www.mathhelpforum.com/math-he...rig-work2.html in question 2 you stated it is the value of b,the phase shift, and i stated in question 2 here that the phase shift is pi/4?

    for 4 it would be 6 units left, right?

    and for 1 the period is 2pi/3, right?

    thanks
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  4. #4
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    Quote Originally Posted by william View Post
    thanks, but i'm still unclear on the phase shift because here http://www.mathhelpforum.com/math-he...rig-work2.html in question 2 you stated it is the value of b,the phase shift, and i stated in question 2 here that the phase shift is pi/4?
    b and \frac{\pi}{4} are in the same place in there respective equations so they mean the same thing.


    Quote Originally Posted by william View Post

    for 4 it would be 6 units left, right?
    It is left



    Quote Originally Posted by william View Post

    and for 1 the period is 2pi/3, right?

    thanks
    Yeppers
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