Use consistent multiplicative factors
a * (1.0*delta) * (1.0/delta) = a but a * (1.0-delta) * (1.0+delta) = a - delta**2 * a != a
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a * (1.0*delta) * (1.0/delta) = a but a * (1.0-delta) * (1.0+delta) = a - delta**2 * a != a