=IF(IF(OR(AND(OR(zy>0;zy=0);OR(zx<0;zx=0));AND(OR(zy<0;zy=0);OR(zx<0;zx=0)));ATAN(zy/zx)+PI();ATAN(zy/zx))<0;ATAN(zy/zx)+2*PI();IF(OR(AND(OR(zy>0;zx=0);OR(zx<0;zx=0));AND(OR(zy<0;zy=0);OR(zx<0;zx=0)));ATAN(zy/zx)+PI();ATAN(zy/zx)))




=IF(270<=DEGREES(S17),IF(AND(270<=DEGREES(S17),DEGREES(S17)<=315),360-DEGREES(S17)+270,315-DEGREES(S17)+315),270-DEGREES(S17))

S vzorec hore