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A = ( 5 + √15) ( √5 - √3)

A  =  5 √5 - 5 √3 + √75 - √45

A = 5 √5 - 5 √3 + 5√3 - 3 √5

A =  2 √5  

B = ( √5 + √2 ) ( √10  - 1 )

B = √50 - √5 + √20 - √2

B =  5√2 - √5 + 2 √5 - √2

B =  4 √2 + √5

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