4.04: Cosine graph
The function is \(y=4\cos x-2\) for \(-360^\circ\leqslant x\leqslant360^\circ\).
(a)[2]
Sketch the graph.
See the official mark scheme below.
(b)[1]
State the amplitude.
See the official mark scheme below.
(c)[1]
State the period.
See the official mark scheme below.
(d)[1]
Find the set of values of \(k\) for which \(4\cos x-2=k\) has at least two solutions in the interval.
See the official mark scheme below.
