Question: Using trigonometric identities express the function 4 cos(x) 4 sin(2x) + cos(3x) in terms of the quantities sin(x) and cos(x). Hence find all x such

Using trigonometric identities express the function 4 cos(x) 4 sin(2x) + cos(3x) in terms of the quantities sin(x) and cos(x). Hence find all x such that 4 cos(x) 4 sin(2x) + cos(3x) = 0.

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