[" Show that: "],[" (i) "sin20^(@)*cos40...

[" Show that: "],[" (i) "sin20^(@)cos40^(@)+cos20^(@)sin40^(@)=(sqrt(3))/(2)]

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(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))=?

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

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

(sin70^(@)+cos40^(@))/(cos70^(@)+sin40^(@))

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

cos20^(@)cos40^(@)-sin5^(@)sin25^(@)=

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

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