Mathematics 9709 · AS & A Level · Trigonometry

Trigonometry — practice question

(a)[3]

Prove that $\displaystyle \frac{1 + \sin\theta}{\cos\theta} + \frac{\cos\theta}{1 + \sin\theta} = \frac{2}{\cos\theta}$.

(b)[3]

Hence solve the equation $\displaystyle \frac{1 + \sin\theta}{\cos\theta} + \frac{\cos\theta}{1 + \sin\theta} = \frac{3}{\sin\theta}$, for $0 \leq \theta \leq 2\pi$.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: Correct algebraic arrangement using $(1+\sin\theta)^2+\cos^2\theta$

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