$\frac{1}{cosa}$
$\frac{dy}{dx}=\frac{\sqrt{y}sin\left(2x\right)}{\sqrt{cos\left(2x\right)}}$
$\lim_{x\to\infty}\left(\frac{3x^2+x-4}{2x+1}\right)$
$18^{18}:18^{18}$
$2\sin^{4}x-3\sin^{2}x+1=0$
$\int\frac{x^2+19x+10}{2x^2+5x}dx$
$3x^5-3x^4$
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