0606 P12 - Nov 2019 - Q1 - 5 marks
8333
(i) Sketch the graph of
\(y=2\cos3x-1\quad\text{for }-90^\circ\leq x\leq90^\circ.\)
(ii) Write down the amplitude of \(2\cos3x-1\).
(iii) Write down the period of \(2\cos3x-1\).
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