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The amplitude is 1.
The amplitude is 4 .
Assuming the question refers to [sin(x)]/2 rather than sin(x/2) the answer is 1.
4
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