Posted by Angela on Sunday, July 24, 2011 at 5:44pm.
max at t = 0 is a cos function
y = A cos (k theta)
max is 2 so
y = 2 cos (k theta)
min of cos is at (k *pi/4) = pi radians
so k = 4
y = 2 cos (4 theta)
Oh if they insist on sin rather than cos, use phase shift of pi/2
y = 2 sin (4 theta - pi/2)
not -pi/2 but +pi/2
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