$\lim_{x\to0}\left(\frac{3e^y+2e^{-x}}{x-5}\right)$
$\int\left(\frac{e^{4\cdot x}+2}{e^{4\cdot x}+e^{-4\cdot x}}\right)dx$
$49h^2+154h+121$
$x^4y-x^3y^2+x^2y-8x^4y$
$x\:+8+5x-4-x$
$\frac{dy}{dx}=84yx^{11}$
$3y+a+6+1+1+y$
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