4 marksProving Simple Trigonometric Identities

CSEC Additional Mathematics · 2015 · Paper 2 · Question 4(c)

Prove the identity (sin θ + sin 2θ) / (1 + cos θ + cos 2θ) = tan θ.

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4(a)Calculate the area of the shaded region.[4 marks]
4(b)Solve the equation 8 sin^2 θ = 5 - 10 cos θ, where 0° ≤ θ ≤ 360°, giving your answer correct to one decimal place.[4 marks]

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