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Mathematics
Mathematics
Problem
Show that
sin
20
∘
cos
10
∘
+
cos
20
∘
sin
10
∘
=
1
2
\sin 20^\circ\,\cos 10^\circ + \cos 20^\circ\,\sin 10^\circ = \dfrac{1}{2}
sin
2
0
∘
cos
1
0
∘
+
cos
2
0
∘
sin
1
0
∘
=
2
1
.
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