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Mathematics
Problem
Simplify the expression
sin
x
cos
20
∘
+
cos
x
sin
20
∘
−
sin
x
cos
70
∘
−
cos
x
sin
70
∘
\sin x \cos 20^\circ + \cos x \sin 20^\circ - \sin x \cos 70^\circ - \cos x \sin 70^\circ
sin
x
cos
2
0
∘
+
cos
x
sin
2
0
∘
−
sin
x
cos
7
0
∘
−
cos
x
sin
7
0
∘
to a single trigonometric ratio in terms of
x
x
x
only.
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