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2023 KSS P1 Q9
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2023 KSS P1 Q9
Secondary 4
7 marks
Find the principal values, in degrees, of
\(\sin^{-1}\left(\dfrac{\sqrt3}2\right)\),
[1]
\(\cos^{-1}(-\sin45^\circ)\).
[1]
Write down the period and the amplitude of \(y=3\cos2x-1\).
[2]
Sketch the graph of \(y=3\cos2x-1\) for \(0^\circ\le x\le180^\circ\).
[3]
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Answer:
(a)(i) \(60^\circ\), (ii) \(135^\circ\). (b)(i) \(180^\circ\), 3. (ii) Cosine sketch shown.
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