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Math Help - trigonometric functions

  1. #1
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    trigonometric functions

    an angle is measured at 1.7 radians.
    what is its measure in degrees minutes and seconds?
    what is its tangent?

    i got that its 97degrees24minutes10seconds

    but cant work out how to get its tangent.

    i also need help finding 4 values for x (in radians) for which cosx = 1/2 would have been lovely if my graphics calculator hadn't run out of batteries!!
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by helmszee View Post
    an angle is measured at 1.7 radians.
    what is its measure in degrees minutes and seconds?
    what is its tangent?

    i got that its 97degrees24minutes10seconds
    correct


    but cant work out how to get its tangent.
    don't they just mean to plug in the angle in your calculator and press tangent?

    i also need help finding 4 values for x (in radians) for which cosx = 1/2 would have been lovely if my graphics calculator hadn't run out of batteries!!
    \cos x = \frac 12

    \Rightarrow x = \frac {\pi}3 + 2n \pi or x = \frac {5 \pi}3 + 2m \pi, for m,n \in \mathbb {Z}

    now pick any four solutions you want, by varying m and n
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  3. #3
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    Quote Originally Posted by Jhevon View Post
    correct


    don't they just mean to plug in the angle in your calculator and press tangent?



    \cos x = \frac 12

    \Rightarrow x = \frac {\pi}3 + 2n \pi or x = \frac {5 \pi}3 + 2m \pi, for m,n \in \mathbb {Z}

    now pick any four solutions you want, by varying m and n
    cant put it in the calculator coz it decided that it wants new batteries which i dont have
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by helmszee View Post
    cant put it in the calculator coz it decided that it wants new batteries which i dont have
    you know, one of the great things about google is that it can function as a calculator. type in tan(1.7) and it will give you the answer. it does radians by default, if you want degrees you would type, for example, tan(13 degrees) and it gives you the answer. you can also type tan(1.7 radians) to make sure you're getting the right thing
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  5. #5
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Jhevon View Post
    you know, one of the great things about google is that it can function as a calculator. type in tan(1.7) and it will give you the answer. it does radians by default, if you want degrees you would type, for example, tan(13 degrees) and it gives you the answer. you can also type tan(1.7 radians) to make sure you're getting the right thing
    Or Windows has a calculator, or Excel can be used, or you can find on online, or you can borrow a friend's calculator, or...

    -Dan
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