I need help ! (sinusoidal models word problems)
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I am not a native, my english is poor sorry.
this is problem in sinusoidal models word problems practice.
C(t) = -15cos(2pi/15*t)+65
t = 15/2pi(2.3005 + 2pi*n)
t is about 5.5 + 15n
Why 15/2pi * 2.3005 is 5.5 here?
I did this on calculater the answer is 54.20425...
It's not clearon text so I add screenshot.
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