Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$y^{\prime}=\frac{2(x^{2}+1)-4x^{2}}{(x^{2}+1)^{2}}=$$

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