in math if the maximum # of people at a resort is 15000 and it drops to the minimum if 500 within 6 months what is the cosine equation that describes this function?
1
Expert's answer
2011-12-08T09:17:31-0500
Let's find the equation in a following form:
N(t) = A*sin(a(t+c)),
where N is the number of people and t is time in months.
Let's solve the following system of equations:
A*sin(a(0+c)) = 15000, A*sin(a(6+c)) = 500;
Since |sin(x)| <= 1, we'll assume A = 15000.
sin(a(0+c)) = 1, sin(a(6+c)) = 1/30;
sin(ac) = 1, sin(6a+ac) = 1/30;
ac = pi/2, 6a+ac = arcsin(1/30);
6a+pi/2 = arcsin(1/30);
a = (arcsin(1/30)-pi/2)/6 ≈ -0.244342861570884;
c = pi/(2a) = pi/((arcsin(1/30)-pi/2)/3) = (3pi)/(arcsin(1/30)-pi/2) ≈ -6.428656506256111.
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