Red 1) Show that [2] 2) Prove that [4] 3) a) Express 12 cos 5 sin in the form cos ( + ), where > 0 and [4] – R R b) Hence solve the equation 12 cos 5 sin = 4 for giving your answer to 1 – [3] decimal place 4) Solve the equation 3 cos 2 cos  + 1 = 0 – giving all solutions in degrees to the nearest degree in the interval 0° 360°.    [6]
Red 1) Show that [2] 2) Prove that [4] 3) a) Express 12 cos – 5 sin in the form R cos ( + ), where R > 0 and [4] b) Hence solve the equation 12 cos – 5 sin = 4 for giving your answer to 1 decimal place [3] 4) Solve the equation 3 cos 2 – cos  + 1 = 0 giving all solutions in degrees to the nearest degree in the interval 0°    360°. [6]
a206_8-assessment-addition-formulas-qp.docx