Results 1 to 2 of 2

Math Help - Trig Help - Unit Circle

  1. #1
    trigwig87
    Guest

    Trig Help - Unit Circle

    I need a little bit of explanation of how to do something.

    for common angles you can find the cordinates and radians easily on charts, such as sin90 is (0,1) pi/2.
    for angles like 15 and 75 degrees... how do i find thing. for any angle?

    thnks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
    Joined
    Feb 2008
    From
    Yuma, AZ, USA
    Posts
    3,764
    Thanks
    78
    To find the sin of a nonstandard angle we need to use trig identities.

    for example

    \sin(15)=\sin(45-30)

    using the difference identity we get...

    \sin(45-30)=\sin(45)\cos(30)-\sin(30)\cos(45)

    Now we could use the sin(15) to calculate the sin75 ect...

    I hope this helps.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Unit circle help
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: May 17th 2011, 09:38 AM
  2. Unit Circle: Trig Functions of Real Numbers
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: December 1st 2009, 05:18 PM
  3. Unit Circle Trig
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: March 4th 2009, 04:30 PM
  4. Inverse trig functions involving the unit circle?
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: March 1st 2009, 12:25 PM
  5. Trig Functions & Unit Circle
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: February 23rd 2009, 10:37 PM

Search Tags


/mathhelpforum @mathhelpforum