If A=60^(@) and B=30^(@), verify that : ...

If `A=60^(@)` and `B=30^(@)`, verify that :
`(i)sin(A-B)=sinAcosB-cosAsinB`
`(ii) cos(A-B)=cosAcosB+sinAsinB`
`(iii) tan(A-B)=(tanA-tanB)/(1+tanAtanB)`

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