IB Maths AA HL AA 3.3 Trigonometric identities and equations questions

Exam-style questions in the shape of Paper 1 and Paper 2, with full markschemes. Read the markscheme, or type, photograph or draw your answer and get it marked.

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Question 1

Paper 2, calculatorHard6 marks

The function $f$ is defined by

f(\theta)=a\sin\theta+b\cos\theta,\qquad 0\leq\theta\leq\pi,

where $a,b\in\mathbb R$ Figure 1 shows the graph of $y=f(\theta)$

(a)

Determine the values of $a$ and $b$

[3]

(b)

For $0<\theta<\pi$ $\theta\ne\frac{\pi}{2}$ define

H(\theta)=f(\theta)f(\pi-\theta)+\tan\theta+\tan(\pi-\theta).

Determine whether $H$ attains a maximum. If it does not, state its supremum.

[3]

A circuit model represents the normalized voltage at phase $\phi$ by $v(\phi)=\sin\phi$ A controller operates at phase $\theta$ where $0<\theta<\frac{\pi}{2}$ During calibration, the normalized voltage at phase $2\theta$ is $\frac12$

(a)

Starting from the compound-angle identities, derive the double-angle identities for $\sin 2x$ $\cos 2x$ and $\tan 2x$

[3]

(b)

Determine all possible exact values of $\tan\theta$

[3]

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