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\frac{4-x^{2}}{x^{2}}
Consider \left(2+x\right)\left(2-x\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Square 2.
\frac{4-x^{2}}{x^{2}}
Consider \left(2+x\right)\left(2-x\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Square 2.