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OpenStudy (megannicole51):
which cosine function has maximum of .5 a minimum of -.5 and a period of (2pi/3)? Is it y= 2cos3(theta) or y=.5cos3(theta)
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jimthompson5910 (jim_thompson5910):
y = A*cos(Bx) has an amplitude of |A| and a period of 2pi/B
jimthompson5910 (jim_thompson5910):
in the first one, A = 2, so the amplitude is |A| = |2| = 2 this means that the max is 2 and the min is -2, which is not what we want
jimthompson5910 (jim_thompson5910):
so we can rule that out
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