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For any three sets `A ,B ,C` prove that: `A-(B uu C)=(A-B)nn(A-C)`

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Let,L.H.S=`A−(BuuC)`
=`Ann(BuuC)′ `
∵`(A−B)=AnnB′`
=`Ann(B′nnC′)`
∵`(BuuC)′=(B′nnC′)`
=`(AnnB′)nn(AnnC′)`
=`(A−B)nn(A−C)`
= R.H.S
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