$\frac{dr}{dt}=r\left(1-r^2\right)$

$y^{\prime}=\frac{\sqrt{x}}{y}$

$\int-e^{-sx}\cdot x\:dx$

$3x-3+2x-5+x+7$

$\left(1-\left(\sin\left(x\right)\cdot\sin\left(x\right)\right)\right)\left(1+\left(\tan\left(x\right)\cdot\tan\left(x\right)\right)\right)$

$-9ab-2a+24ab-7ab-32a$

$\int\frac{2x+1}{e^{x^2+x}}dx$