निम्न मे से कोन सही है? (a) (a-b)^(2)=a...

निम्न मे से कोन सही है?
(a) `(a-b)^(2)=a^(2)+2ab-b^(2),`
(b) `(a-b)^(2)=a^(2)-2ab+b^(2)`
(c) `(a-b)^(2)=a^(2)-b^(2),`
(d) `(a+b)^(2)=a^(2)+2ab-b^(2),`

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