$y'+y=20t$
$\frac{2}{\cot\left(z\right)-\tan\left(z\right)}=\tan\left(2z\right)$
$\int\:\frac{1}{2}ln\left(5x\right)dx$
$-0.a^2+0.5ab+10ab^2$
$\int\left(\frac{x^3-8}{x-2}\right)dx$
$\int5tan\left(2x\right)ln\left(sec\left(2x\right)\right)dx$
$g1$
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