$cos\left(x+\frac{\pi}{3}\right)+cos\left(x-\frac{\pi}{4}\right)$
$20n^2+13n-15$
$e^{3y}dy-\frac{12x^2}{x^3+1}dx=0$
$2m^2+\:29m\:+\:90$
$\frac{4a^2b^2c^2}{-2bc}$
$2.3-5.4$
$\frac{1296-x^4}{6-x}$
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