Evaluate each of the following
sin 20° sin 70° - cos 20° cos 70°
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Answer:
0
Step-by-step explanation:
sin 20° sin 70° - cos 20° cos 70°
= sin 20° sin (90°-20°) - cos 20° cos (90°-20°)
=sin 20° cos 20° - cos 20° sin 20°
=0
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