Question: a. Use the identity cos (A + B) cos A cos B sin A sin B, to show that cos 2A 2

a. Use the identity cos (A + B) ≡ cos A cos B − sin A sin B, to show that cos 2A ≡ 2 cos2 A − 1The curves C and C have equations C: y = 4 cos

b. Show that the x-coordinates of the points where C1 and C2 intersect satisfy the equation cos 2x + 3 sin 2x − 3 = 0

The curves C and C have equations C: y = 4 cos 2x C: y = 6 cosx-3 sin 2x

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