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Mathematics
Problem
Prove the identity:
sin
a
sin
b
(
cot
a
+
cot
b
)
=
sin
(
a
+
b
)
\sin a\sin b\,(\cot a + \cot b) = \sin(a+b)
sin
a
sin
b
(
cot
a
+
cot
b
)
=
sin
(
a
+
b
)
.
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