Q$1)$ Find the following limits :

A$)\underset{x}{lim}\frac{2x+1}{4-x}$

B$)\underset{x-}{lim}\frac{2x^3+x-6}{1-2x}$

C$)\underset{x-}{lim}ta{n}^{-1}x$

D$)\underset{x}{lim}\frac{e^x+e^{-x}}{e^x-e^{-x}}$

E$)\underset{x}{lim}(x+\sqrt[\phantom{2}]{x^2+2x})$

F$)\underset{x}{lim}(x-\sqrt[\phantom{2}]{x^2+2x})$

G$)\underset{x{1}^{+}}{lim}\sqrt[\phantom{2}]{1-x}$

H$)\underset{x}{lim}\frac{1}{x^3}$

I$)\underset{x}{lim}\frac{cosx}{x}$

J$)\underset{x{2022}^{-}}{lim}[x]$

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