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(11)/(rarr(i))(" Ard "^(2)+2(2))/(cos x)...

(11)/(rarr(i))(" Ard "^(2)+2(2))/(cos x)=cos60^(@)cos80^(@)+sin60^(@)sin30^(@)

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

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

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

cos 60^(@) sin 30^(@) +cos 30^(@) sin 60^(@)=

co60^(@)sin30^(@)+cos30^(@)sin60^(@) =___.

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

cos30^(@)sin60^(@)+cos60^(@)sin30^(@)= ……………………

Prove that : cos30^(@).cos60^(@)-sin30^(@).sin60^(@)=0

Prove that : cos30^(@).cos60^(@)-sin30^(@).sin60^(@)=0

Prove that : sin60^(@)cos30^(@)+cos60^(@).sin30^(@)=1