$\int8te^{7t}\:dt$

$9cm\cdot7\cdot9$

$\sin\left(x\right)=\cos\left(2x\right)+2$

$3ab^3.2a^2-3a+2ab$

$y^{'\:}=\frac{y\left(y-2\right)}{x\left(x-1\right)}$

$\int\:\frac{x+5}{\left(x+4\right)\left(x^2-1\right)}dx$

$2\left(-5\right)-4\left(-1\right)+3$