Posted by spencer on Monday, March 18, 2013 at 1:21am.
pi/2 * 5/2 = 5/4 pi
so, we want a sin(5/4 pi) = -9.546
Since sin 5/4 pi = -1/√2, we want
a (-1/√2) = -9.546
a = 13.5
So, y = 13.5 sin(pi/2 x)
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