# Trigonometry : Amplitude

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1. y=cos x; for x=4pi

2. Determine the Amplitude of: y = 3 sin x

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#### Solution Preview

A full revolution of a circle corresponds to an angle of 2Pi

Therefore, angle 4Pi is equivalent to two full revolutions.

Hence, it is also equivalent to an angle of ...

#### Solution Summary

A cosine is evaluated and an amplitude is found.

$2.49