" Show that "cos100^(@)cos40^(@)+sin100^...

" Show that "cos100^(@)cos40^(@)+sin100^(@)sin40^(@)=(1)/(2)

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cos70^(@)+sin40^(@)=

cos70^(@)+sin40^(@)=

S.T cos340^(@) . Cos40^(@)+sin200^(@).sin140^(@)=(1)/(2)

Show that cos 340^(@) cos 40^(@)+sin 200^(@) sin 140^(@) = 1/2 .

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

Simplify cos 100^(@) cos 40^(@) +sin 100^(@) sin 40^(@)

cos100^@cos10^@+sin100^@sin10^@=

Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1

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