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Mathematics
Mathematics
Problem
Find the acute angle between the planes
2
x
+
3
y
−
5
z
=
4
2x + 3y - 5z = 4
2
x
+
3
y
−
5
z
=
4
and
x
−
2
y
+
4
z
=
9
x - 2y + 4z = 9
x
−
2
y
+
4
z
=
9
.
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