" 142.The value of "sin20^(@)sin40^(@)sin80^(@)" equals "

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The value of sin20^@ sin40^@ sin60^@ sin80^@

Find the value of sin 20^@ sin 40^@sin 80^@

sin20^(@)sin40^(@)sin60^(@)sin80^(@)

The value of sin20^@sin 40^@sin 60^@sin 80^@ is

Find sin20^(@)sin40^(@)sin60^(@)sin80^(@) .

Prove that 8 sin20^(@) sin40^(@) sin80^(@) = sqrt3

The value of sin10^(@)+sin20^(@)+sin30^(@)...+sin360^(@) is equal to -