1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Trigonometry (Further Maths)

  1. May 27, 2013 #1
    Verify the compound angle formulae for;

    a) sin (20° + 30°)

    sin(A + B) = sinAcosB + cosAsinB

    sin(20°+30°) = (sin20°)(cos30°) + (cos20°)(sin30°)

    0.76 = (0.34 x 0.87) + (0.94 x 0.5)

    0.76 = 0.29+0.47

    0.76 = 0.76


    b) cos (30° + 40°)

    cos(A + B) = cosAcosB - sinAsinB

    cos(30°+40°) = (cos30°)(cos40°) - (sin30°)(sin40°)

    0.34 = 0.87 x 0.77 - 0.5 x 0.64

    0.34 = 0.67 - 0.32

    0.34 = 0.35

    Can someone please verify these answer for me? as I am not good in maths so I just wanted make sure if i had done it right or do I need any changes?
     
  2. jcsd
  3. May 27, 2013 #2

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    If the LHS = RHS, it's verified.
     
  4. Jun 19, 2013 #3
    It's only the matter of the integration of the decimal
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Trigonometry (Further Maths)
  1. Further Trigonometry (Replies: 1)

Loading...