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Problem
Problem
Find the measure of the angle of intersection of the lines whose equations are
3
x
+
4
y
+
7
=
0
3x + 4y + 7 = 0
3
x
+
4
y
+
7
=
0
and
4
x
−
3
y
+
5
=
0
4x - 3y + 5 = 0
4
x
−
3
y
+
5
=
0
.
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