arctan(y/(raciney)-1) =x
tan(x)=y/(√y-1)
y-√y.tan(x)+tan(x)=0
√y=(tan(x)-√(tan²(x)-4tan(x))/2 ou √y=(tan(x)+√(tan²(x)-4tan(x))/2
y=(tan(x)-√(tan²(x)-4tan(x))²/4 ou y=(tan(x)+√(tan²(x)-4tan(x))²/4
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arctan(y/(raciney)-1) =x
tan(x)=y/(√y-1)
y-√y.tan(x)+tan(x)=0
√y=(tan(x)-√(tan²(x)-4tan(x))/2 ou √y=(tan(x)+√(tan²(x)-4tan(x))/2
y=(tan(x)-√(tan²(x)-4tan(x))²/4 ou y=(tan(x)+√(tan²(x)-4tan(x))²/4