$Q\mathrm{.}2$: Which statement$(s)$ are correct?

$ay=x^{3}we$ assume small change $ofx+x$ which will result

$in$ change $y+y.$

$bx+x$ and $y+y$ into $y=x^3$ one obtains $y+y=(x+x{)}^3.$

$cy+y=(x+x{)}^3$ results $iny+y=x^3+3x^{2}x+3x{x}^2+x^3.$

$dy+y=x^3+3x^{2}x+3x{x}^2+x^{3}is$ reduced $toy=3x^{2}x+3x{x}^2+x^3$ since $y=x^3.$

$ex$ results $in\frac{y}{x}=3x^2+3xx+x^2.$

$fx0$ the result $is\underset{x0}{lim}\frac{y}{x}=\underset{x0}{lim}(3x^2+3xx+x^2),or$ finally $\frac{dy}{dx}=3x^2.$