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Mathematics
Mathematics
Problem
The circles
x
2
+
y
2
+
x
+
y
=
0
x^2 + y^2 + x + y = 0
x
2
+
y
2
+
x
+
y
=
0
and
x
2
+
y
2
+
x
−
y
=
0
x^2 + y^2 + x - y = 0
x
2
+
y
2
+
x
−
y
=
0
intersect at an angle of a.
π
/
6
\pi/6
π
/6
b.
π
/
4
\pi/4
π
/4
c.
π
/
3
\pi/3
π
/3
d.
π
/
2
\pi/2
π
/2
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