Discussion
The value of \(\sin 20° \cos 70° + \cos 20° \sin 70°\) is:
Answer: B
This expression is in the form of the sine addition formula: \(\sin(A+B) = \sin A \cos B + \cos A \sin B\).
Here, A = 20° and B = 70°.
The expression is equal to \(\sin(20° + 70°) = \sin(90°)\).
The value of \(\sin 90°\) is 1.
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