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doc: Fix typo in approximation of square root
See https://en.wikipedia.org/wiki/Newton%27s_method#Square_root_of_a_number R=golang-dev, minux.ma, adg CC=golang-dev https://golang.org/cl/9145044
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@ -295,9 +295,9 @@ package newmath
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// Sqrt returns an approximation to the square root of x.
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// Sqrt returns an approximation to the square root of x.
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func Sqrt(x float64) float64 {
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func Sqrt(x float64) float64 {
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z := 0.0
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z := 1.0
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for i := 0; i < 1000; i++ {
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for i := 0; i < 1000; i++ {
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z -= (z*z - x) / (2 * x)
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z -= (z*z - x) / (2 * z)
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}
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}
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return z
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return z
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}
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}
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