$\int_2^{\infty}38e^{1.9x}dx$
$\frac{x^4+2}{x^2+5x+4}$
$\frac{a^2}{ab}$
$\left(+145\right).\left(-3\right)$
$\frac{1-\cos\left(\theta\right)}{1+\cos\left(\theta\right)}=\csc\left(\theta\right)^2-\cot\left(\theta\right)^2$
$980=x+237$
$-2^3+4\left(-2^2\right)-2-1$
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