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Mathematics
Problem
The number of positive integral solutions of
tan
−
1
x
+
cot
−
1
y
=
tan
−
1
3
\tan^{-1} x + \cot^{-1} y = \tan^{-1} 3
tan
−
1
x
+
cot
−
1
y
=
tan
−
1
3
is a. one b. two c. three d. four
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