$\frac{3x^2}{x^5}$
$\int\left(\frac{\sqrt{a}+\sqrt{v}}{\sqrt{ax}}\right)^4dv$
$\lim_{x\to0}\left(\frac{\sqrt{1+2x}\sqrt{1-4x}}{x}\right)$
$3\sin x+1=-\cos2x$
$4x^{\frac{5}{3}}-\frac{x^{\frac{5}{3}}}{2}$
$\frac{cos\left(a-b\right)}{sina\:sinb}$
$2^2-3^2-2^2$
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