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[" this the thave that) "cos80^(@)+cos40...

[" this the thave that) "cos80^(@)+cos40^(@)-cos20^(@)=0],[" sin "10^(@)+sin20^(@)+sin40^(@)+sin50^(@)=sin70^(@)+sin80^(@)]

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sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)=sin70^(@)+sin80^(@)

sin20^(@)+sin40^(@)-sin80^(@)=

sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)-sin70^(@)-sin80^(@)=

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

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

Show that sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@) =sin70^(@)+sin80^(@)

sin 10^(@) + sin 20^(@) + sin 40^(@) + sin 50^(@) - sin 70^(@) - sin 80^(@) =

Prove that sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)=sin70^(@)+sin80^(@) .

(cos20^(@)+8sin10^(@)sin50^(@)sin70^(@))/(sin^(2)80^(@))=