Question 888400
Determine a possible equation for a cosine function with an amplitude of 3, a period of pi and a minimum value at (0, -4). 
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period = 2pi/b = pi
b = 2
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y = -3cos(2x) -1
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{{{graph(400,400,-6,6,-5,5,-3cos(2x)-1)}}}
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Cheers,
Stan H.