[" (a) "7440000," an "1151],[tan^(-1)(x-...

[" (a) "7440000," an "1151],[tan^(-1)(x-1)+tan^(-1)x+tan^(-1)(x+1)=tan^(-1)3x," tan "^(-1)3x],[" (n) fros anfry ",2a-],[|[a-b-c,2a,2a],[2b,b-c-a,2b],[2c,2c,c-a-b]|=(a+b+c)^(3)]

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