trigonometry question

• Lawmaurice

  28 Aug 11, 12:03

  Find all the angles between 0 and 2Ï€ for which 3 sin x = 4 cos (x + 2)
• wee_ws

  28 Aug 11, 13:14

  Hi,

    Begin by considering the result of cos (A + B).

  Cheers,
  Wen Shih

• ascklee

  3 Sep 11, 00:24

  ... remembering that "2" is in radian.

  Looks very much like question 2(d) (Miscellaneous Exercise 13, p. 297) in Ho Soo Thong's Panpac Additional Mathematics.

   

  Sincerely,

  CKLee

  Free additional mathematics stuff available at http://ascklee.org/.