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18) Evaluate (2+1)-(2-1) |
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Answer» Denote √2 as "a" (a+1)^5-(a-1)^5 =(1+a)^5+(1-a)^5 =2(1+10a²+5a^4) =2(1+10*2+5*4) =2(1+20+20) =2(41) =82 |
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