This constant returns the numeric value of the square root of 0.5.

The resulting value returned is approximately 0.707106781186548 (to 15.d.p.)

Note that the value of

`Math.SQRT1_2`is approximately the reciprocal of the value of`Math.SQRT2`. The word approximately is used here because the mathematical accuracy of JavaScript implementations leaves something to be desired and there are some strange artifacts in some of the calculations.

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