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Evaluate each of the following : cos60...

Evaluate each of the following :
`cos60^(@)cos30^(@)-sin60^(@)sin30^(@)`

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Verify each of the following : (i) sin60^(@)cos30^(@)-cos60^(@)sin30^(@)=sin30^(@) (ii) cos60^(@)cos30^(@)+sin60^(@)sin30^(@)=cos30^(@) (iii) 2sin 30^(@)cos30^(@)=sin60^(@) (iv) 2sin45^(@)cos45^(@)=sin90^(@)

Evaluate : cos60^(@)cos30^(@)+ sin 60^(@)sin30^(@)

Evaluate the following : sin60^(@)cos30^(@)+sin30^(@)cos60^(@)

Evalulate the following : sin60^(@)cos30^(@)+sin30^(@)cos 60^(@)

sin60^(@).cos30^(@)+cos30^(@)*sin60^(@)

Find the value of cos60^(@) cos 30^(@)-sin 60^(@) sin 30^(@)

Find the value theta in the following :- costheta=cos60^@ cos30^@ +sin60^@ sin30^@ .

"(1) "sin60^(@)cos30^(@)+sin30^(@)cos60^(@)