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Mathematics
Mathematics
Problem
Prove that : a.
cos
55
∘
sin
35
∘
+
sin
55
∘
cos
35
∘
=
1
\cos 55^\circ \sin 35^\circ + \sin 55^\circ \cos 35^\circ = 1
cos
5
5
∘
sin
3
5
∘
+
sin
5
5
∘
cos
3
5
∘
=
1
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