Maths class 9 plss fast
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a²+1/a²-18
(splitting the number -18)
=a²+1/a²-2-16
=(a²+1/a²-2)-16
=(a²+1/a²-2*a*1/a)-(4)²
=(a-1/a)²-(4)²
using the identity a²-b²=(a+b)(a-b)
=(a-1/a+4)a-1/a-4)
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