Find ` sin 5^(@) cos 85^(@) +cos 5^(@) sin 85^(@) `

sin 85^(@)-sin 35^(@) - cos 65^@

Show that cos 35^(@) + cos 85^(@) + cos 155^(@) = 0

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

The value of (sin 1^(@) + sin 3^(@) + sin 5^(@) + sin 7^(@))/( cos 1^(@) .cos2^(@).sin4^(@)) is"________"

Find the value of sin 330^(@) .cos 120^(@) + cos 210^(@) . Sin 300^(@) .

Prove that cos35^(@)+cos85^(@)+cos155^(@)=0