What is the period and amplitude and frequency for $y = cos 4x$ ?

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Answer 1 · 2015-06-04T02:29:12

Period: $x = 2pi/4 = pi/2$

Because $sin 4x = sin (4x + 2pi) = sin [4(x + pi/2)]$

Amplitude: (-1, 1) since cos 4x varies between -1 and +1

What is the period and amplitude and frequency for y = cos 4xy = cos 4x?