Question: a. Show that 3 cos 2 x sin 2 x 1 + 2 cos 2x. b. Hence sketch, for < x <

a. Show that 3 cos2 x − sin2 x ≡ 1 + 2 cos 2x.

b. Hence sketch, for −π < x < π, the graph of y = 3 cos2 x − sin2 x, showing the coordinates of points where the curve meets the axes.

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