0/2011
(a)
Prove that cos3x = 4cos'x - 3cos x. Hence, show that
cos2x =-(cos 6x + 3cos 2x...
Mathematics, 17.11.2020 09:30 lexybellx3
0/2011
(a)
Prove that cos3x = 4cos'x - 3cos x. Hence, show that
cos2x =-(cos 6x + 3cos 2x).
(b)
[4 marks]
Use the above identity to find all the solutions in the interval
-180° <x<180° of the equation 2 cos 3x + cos2x+1= 0. [7 marks]
Answers: 1
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