(5-1)(5+1)(5²+1)(5⁴+1)(5^8+1)-5^16+13=(5²-1)(5²+1)(5⁴+1)(5^8+1)-5^16+13=(5⁴-1)(5⁴+1)(5^8+1)-5^16+13=(5^8-1)(5^8+1)-5^16+13=5^16-1-5^16+13=-1+13=12
(a+b)(a-b)=a²-b²
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(5-1)(5+1)(5²+1)(5⁴+1)(5^8+1)-5^16+13=(5²-1)(5²+1)(5⁴+1)(5^8+1)-5^16+13=(5⁴-1)(5⁴+1)(5^8+1)-5^16+13=(5^8-1)(5^8+1)-5^16+13=5^16-1-5^16+13=-1+13=12
(a+b)(a-b)=a²-b²
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