$\frac{1}{\cos\left(a\right)}=\frac{1}{2t^2-1}$
$2x^3+9x^2+13x+6$
$\int_{-\infty}^0\left(2t^2e^t\right)dt$
$-\frac{5}{9}v-2\le\frac{7}{6}v+\frac{4}{9}$
$\int3ay^2\:dy$
$\int\left(x\cdot\tan\left(x^2\right)\right)dx$
$\ln\left(2+2x\right)$
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