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Verify each of the following : (i) sin...

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^(@)`

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