Find the amplitude and the period and sketch the graph of the equation:
(a) y = 3 cos x
(b) y = cos 3x
(c) y =
cos x
(d) y = cos
x
(e) y = 2 cos
(f) y =
cos 3x
(g) y = −3 cos x
(h) y = cos (−3x)
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