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Mathematics
Problem
Show that
cot
142
1
2
∘
=
2
+
3
−
2
−
6
\cot 142\frac{1}{2}^\circ = \sqrt{2} + \sqrt{3} - 2 - \sqrt{6}
cot
142
2
1
∘
=
2
+
3
−
2
−
6
.
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