Trigo Qn

• wishboy

  12 Feb 08, 23:16

  Prove that

  sin (7x/2) cos (x/2) + cos (9x/2) sin (x/2) = sin 4x cos x

  help needed with this qn

  2 more days test on trigo formulas liao

• wishboy

  12 Feb 08, 23:22

  haha i suddenly noe how to do this qn after i clicked post topic :D

  kk can close liao

• gunner77

  16 Feb 08, 20:37

  TOA ---> Tan = opp/adj

  CAH----> Cos = adj/hyp

  SOH-----> Sin = opp/hyp