a²-1/a=4 find a⁶-1/a³
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Sincea²+1/a²=1,then(a+1/a)²= a²+1/a²+2,(a+1/a)²=1+2=3 ... (a+1/a)(a²+1/a²-1) ,a³+1/a³=√3×(1-1),then a³+1/a³=√3×0=0. ... write three immediate prior number for 25642 ....
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