16(3) y = xlny, y' = lny + xy'/y,
yy' = ylny + xy', y' = ylny/(y-x)
17(3) x - y + (1/2)siny = 0, 1- y' + (1/2)y' cosy,
y' = 2/(2-cosy),
y'' = -2(siny)y' / (2-cosy)^2 = -4siny / (2-cosy)^3
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