$\int\frac{1}{3\sin\left(t\right)-4\cos\left(t\right)}dt$
$\frac{\left(\sec^2x-1\right)\cdot cosx}{\tan x\cdot sinx+cosx}$
$81-x^2$
$12x^3+45x^2+3x^2$
$-\frac{21}{-7}$
$2\sqrt{22}\cdot\frac{\sqrt{3}}{2}$
$\frac{x-3}{x^2-3x}$
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