Solve -sin 20° sin 40° sin 60° sin 80°sin 20° cos 30° sin 40°

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Kartik.
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Solve -
sin 20° sin 40° sin 60° sin 80°

sin 20° cos 30° sin 40° cos 10°
hmm...?
 
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Yes, they are both equal to 3/16 and this is "general math". What is your point?
 

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