$45r^3-10r^3$

$\left(t+2\right)\left(t^2-2t+4\right)$

$\frac{\left(2xy\right)^4}{4xy}$

$\frac{dy}{\:dx}-tan\left(x\right)y=sen\left(x\right)cos\left(x\right)y^3;y\left(0\right)=1$

$\int_2^86xdx$

$\int\frac{1}{\left(x+2\right)\left(x-3\right)\left(x-1\right)}dx$

$-5.82-\left(-7.8\right)$