Question

Find the value of:

sin 20° sin 40° sin 60° sin 80° = ? ​

Answer 1

Hmm, good question :

Step-by-step explanation:

See the attachment.

Answer 2

sin 20° sin 40° sin 60° sin 80°

sqrt3/2(sin(60 - 40)sin20sin(60 +20)

sqrt3/2(1/4*sin3(20))

(sqrt3/8)(sin60)

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