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Show that cos 340^(@) cos 40^(@)+sin 200...

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

Text Solution

Verified by Experts

The correct Answer is:
`=cos 920^(@)+40^(@))=cos 60^(@) =1//2 =R.H.S`
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