Evaluate `|[x,y,x+y],[y,x+y,x],[x+y,x,y]|` – InterviewSolution

1.	Evaluate `\|[x,y,x+y],[y,x+y,x],[x+y,x,y]\|`
Answer» `C_1->C_1+C_2` `\|[2(x+y),y,x+y],[2(x+y),x+y,x],[2(x+y),x,y]\|` `R_1->R_1-R_3,R_2->r_2-R_3` `2(x+y)\|[0,y-x,x],[0,y,x-y],[1,x,y]\|` `2(x+y)((y-x)(x-y)-xy)` `2(x+y)(xy-x^2-y^2+xy-xy)` `2(x+y)(xy-x^2-y^2)`.

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