c# - Return value of math.sqrt -

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i have been try draw function of y^2=4*a*x have run problem. when use math.sqrt function find square root of value has 2 answer +or- positive value. i.e if found sqrt of 4 return +2 instead of + or -2.

any appreciated.

you can write own method return both values:

public static ienumerable<double> sqrt(double d) {     var result = math.sqrt(d);     yield return result;     yield return -result; }

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