Atan2 Formula - Inverse Trigonometric Functions

Formula:

atan2(y,x) = arctan(y/x) if x > 0,
atan2(y,x) = arctan(y/x) + π if x < 0 and y≥0,
atan2(y,x) = arctan(y/x) - π if x < 0 and y < 0,
atan2(y,x) = +π / 2 if x=0 and y > 0,
atan2(y,x) = - π / 2 if x=0 and y < 0,
atan2(y,x) = undefined if x=0 and y=0


Where,

x = x co-ordinate
y = y co-ordinate

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