$\int_0^{\infty}e^{-x}cos\left(3x\right)dx$
$\int\left(sec\right)^23zdz$
$55-\left(-900\right)$
$186=16+\frac{x}{14}$
$\frac{\left(-12x^3+28x^2-7x-12\right)}{-2x-1}$
$\int\frac{\sqrt{a^4-x^2}}{x^2}dx$
$\int\frac{18-2x}{\left(4x-1\right)\left(x-4\right)}dx$
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