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[" 20."sin20^(@)+sin40^(@)-sin80^(@)=],[...

[" 20."sin20^(@)+sin40^(@)-sin80^(@)=],[qquad [" 1) "-1," 2) "1]" 3) "2]

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

sin^(3)20^(@)+sin^(3)40^(@)-sin^(3)80^(@)=

sin20sin40sin80

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

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

sin 20^(@) sin 40^(@) sin 60^(@) sin 80^(@) =(3)/(16)

(2cos40^(@)-cos20^(@))/(sin20^(@))

(2cos40^(@)-cos20^(@))/(sin20^(@))

(2cos40^(@)-cos20^(@))/(sin20^(@))=?