Question:`x/a+y/b`=2;ax+by=`a^2+b^2`সমীকরণজোটের সমাধান কোনটি ? 

A (x,y)=(-a,-b) 

B (x,y)=(a,b) 

C (x.y)=(a,-b) 

D (x,y)=(-a,b) 

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