sin 20 sin 40° sin 80°
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Answer:
hi..
Step-by-step explanation:
use the triple angle formula...
sinA* sin (60-A)*sin (60+A)=1/4 sin3A...
sin20* sin (60-20)*sin (60+20)=1/4 sin3*20
1/4 *sin 60=√3/8
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