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Mathematics
Mathematics
Problem
Solve the equation:
tan
−
1
x
−
1
x
−
2
+
tan
−
1
x
+
1
x
+
2
=
π
4
\tan^{-1} \frac{x-1}{x-2} + \tan^{-1} \frac{x+1}{x+2} = \frac{\pi}{4}
tan
−
1
x
−
2
x
−
1
+
tan
−
1
x
+
2
x
+
1
=
4
π
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