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(1-cos 40^(@))/(2)=...

`(1-cos 40^(@))/(2)=`

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( sin 70^(@) + cos 40^(@) )/( cos 70^(@) + sin 40^(@))=

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

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

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

(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@)) =

(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@))=

(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@))=

if ( cos ^(3) 20^@ + cos^(3) 40^(@))/( cos 20^@+ cos 40^(@)) = k ,then the value of k is

sin25^(@)cos115^(@)=(1)/(2)(sin40^(@)-1)