0606 P13 - Nov 2019 - Q2 - 6 marks
8345
(i) Sketch the graph of
\(y=5\cos4x-3\quad\text{for }-90^\circ\leq x\leq90^\circ.\)
(ii) Write down the amplitude of \(y\).
(iii) Write down the period of \(y\).
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