atan2()

    
Also See:   abs acos asin atan ceil cos cosh exp floor fmod int log log10 power random rnd sin sinh sqrt srandom tan tanh

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Returns the arctangent of y/x. This is similar to atan(), but the signs of y and x are taken into account when computing the quadrant of the result. The results are returned in radians.
Syntax 
atan2( x, y )
Returns the results in radians.
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