pi definition -- Math
pi definition -- Math
pi=3.14159...=4*arctan(1)=imag(log(-1))
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arctan(x/y) v.s. arctan2(x,y) -- Math
arctan(x/y) v.s. arctan2(x,y) -- Math arctan2(x,y) is similar to arctan(x/y) but a little difference is arctan can handle when y is equal to zero and arctan2 can handle when x is not equal to zero and y is equal to zero. more details and definition on: wiki website Atan2 - 維基百科，自由的百科全書 (wikipedia.org)
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