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Math Help - New to Trig. How to find cos tan and sin?

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    New to Trig. How to find cos tan and sin?

    I am new to trigonometry,so sorry if i don't quite get it.
    I know that like cos (60)=.5, and i use the tables for my current problems, but i was wondering..

    Is there a way to find it out by yourself, and not look at the tables? Like is there a formula for this?

    For example,

    I need to find x.
    So i do cos (60) =x/13
    cos(60) x 13=x
    How do i find cos(60)? i know it is .5, but i can't memorize the table. Thanks in advance


    EDIT: nvm haha that made no sense i get it now
    Last edited by timmykins02; October 30th 2009 at 03:01 AM.
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    Quote Originally Posted by timmykins02 View Post
    I am new to trigonometry,so sorry if i don't quite get it.
    I know that like cos (60)=.5, and i use the tables for my current problems, but i was wondering..

    Is there a way to find it out by yourself, and not look at the tables? Like is there a formula for this?

    For example,

    I need to find x.
    So i do cos (60) =x/13
    cos(60) x 13=x
    How do i find cos(60)? i know it is .5, but i can't memorize the table. Thanks in advance


    EDIT: nvm haha that made no sense i get it now
    Fair enough, I find it easier to get the values from the special triangles
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