{"result":{"text":"Let space n element of N space and space open parentheses 1 plus x plus x squared close parentheses to the power of n equals sum from r equals 0 to 2 n of a subscript r x to the power of r space then comma space a subscript 0 superscript 2 minus a subscript 1 superscript 2 plus a subscript 2 superscript 2 minus... plus a subscript 2 n end subscript superscript 2 equals"},"status":"ok"}