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The amplitude of a function is half the distance between the maximum and minimum values. This is the absolute value of the number in front of the trig function.

for example,

y=Asin(x) or y= Acos(x)

the absolute value of A is the amplitude.

Therefore, the amplitude of y=-2sinx is 2

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Q: How do you determine that the amplitude of y equals -2 sin x?
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