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Mathematics
Mathematics
Problem
If
2
sin
x
−
3
cos
x
sin
x
+
cos
x
=
1
\frac{2 \sin x - 3 \cos x}{\sin x + \cos x} = 1
sin
x
+
cos
x
2
sin
x
−
3
cos
x
=
1
find
cos
2
x
\cos 2x
cos
2
x
.
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