Question: a. Use the double-angle formulae to prove that 1 - cosx/1 + cos2x tan 2 x. b. Hence find, for x

a. Use the double-angle formulae to prove that 1 - cosx/1 + cos2x ≡ tan2 x.

b. Hence find, for −π ≤ x ≤ π, all the solutions of 1 - cosx/1 + cos2x = 3, leaving your answers in terms of π.

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