Question

Vă rog mult exz 5 repede

Answer 1

$\rm E(x)=\frac{x+1}{x^2+1}:\Big(\frac{x+3}{4x-4}-^{4)}\frac{1}{x-1}\Big)*\Big(^{x+1)}1-\frac{1}{x+1}\Big) \\ \\ E(x)=\frac{x+1}{x^2+1}:\Big(\frac{x+3}{4x-4}-\frac{4}{4x-4}\Big)*\Big(\frac{x+1-1}{x+1}\Big) \\ \\ E(x)=\frac{x+1}{x^2+1}:\frac{x-1}{4x-4}*\frac{x}{x+1} \\ \\ E(x)=\frac{x+1}{x^2+1}:\frac{x-1}{4(x-1)}*\frac{x}{x+1} \\ \\ E(x)=\frac{x+1}{x^2+1}*4*\frac{x}{x+1} \\ \\ E(x)=\frac{4x(x+1)}{(x^2+1)(x+1)} \\ \\ \boxed{\rm E(x)=\frac{4x}{(x^2+1)}}$