<span><span>The derivative is: y= 4<span>(<span><span>x</span></span></span></span></span>³<span><span><span><span>−<span>x</span></span></span></span></span>²<span><span><span><span>+x+1</span>)</span><span>e</span></span></span>×<span><span><span>/</span></span><span><span>(<span><span>x</span></span></span></span></span>²<span><span><span><span>+1</span>)</span></span></span>²