$\lim_{x\to0}\frac{\sin x+x\cos x}{\sin x}$
$\frac{d}{dx}7x^5.\arctan x$
$\int\frac{7}{8}e^xdx$
$\int\frac{2t^2+11t+8x}{t^3+4t^2+4t}dx$
$y'=\left(\frac{2y}{x}\right)+x^2e^x$
$56x^2-29x-195$
$4\cdot36$
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