var math.tanhQ4 uses
math (current package)
tanh.go#L62: var tanhQ = [...]float64{
tanh.go#L101: z = x + x*s*((tanhP[0]*s+tanhP[1])*s+tanhP[2])/(((s+tanhQ[0])*s+tanhQ[1])*s+tanhQ[2])
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