Results 1 to 2 of 2

Math Help - Solve trig problems

  1. #1
    Junior Member
    Joined
    Feb 2007
    Posts
    32

    Solve trig problems

    Find the exact value of Cos 53 Cos 8 + Sin 53 Sin 8. I was told that the answer to the problem is Sqrt2/2. When I solve the problem I get

    Cos 61 + Sin 61
    which is about 60
    then Cos 61 approx 1/2 and Sin of 61 is approx sqrt3/2 which I do not get to equal sqrt2/2.

    Can someone please help and explain to me what I need to do or what the correct answer is? Thank you for your help
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Moo
    Moo is offline
    A Cute Angle Moo's Avatar
    Joined
    Mar 2008
    From
    P(I'm here)=1/3, P(I'm there)=t+1/3
    Posts
    5,618
    Thanks
    6
    Hello,

    Do you remember that cos(a-b)=cos(a)cos(b) + sin(a)sin(b) ?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Compute Trig Function Values, Solve Trig Equation
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: September 8th 2011, 07:00 PM
  2. Replies: 7
    Last Post: April 15th 2010, 08:12 PM
  3. Can somebody help solve this problems please
    Posted in the Business Math Forum
    Replies: 1
    Last Post: March 3rd 2009, 07:30 PM
  4. plz solve these problems.....
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: January 22nd 2009, 08:42 AM
  5. Two Problems to Solve
    Posted in the Algebra Forum
    Replies: 4
    Last Post: May 14th 2008, 10:39 AM

Search Tags


/mathhelpforum @mathhelpforum