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Hi;
Welcome to the forum.
Hi;
Have you tried Mathisfun?
This question is sort of a paradox, some people give 6 / 11 as the answer., some 12 / 22 as the answer and a horrible book gives 3 / 5.
Hi;
Tried these
y^2 - x^2
1/(x^2 + y^2)
sin(x*180/pi)-cos(y*180/pi)
sin(x)*cos(y)
All looked okay. Very nice!