$12-36+15.3-3-6\left(-9\right)$

$\sen^{2}\theta=2\cos\theta+2$

$\int\left(2xe^{20x}\right)dx$

$\frac{1+\sin\left(x\right)}{\cos\left(x\right)+\sin\left(x\right)\cos\left(x\right)}=\frac{1}{\cos\left(x\right)}$

$4x^2-36x+9$

$\lim_{x\to0}\frac{\left(e^{5x}-1\right)\left(e^{3x}-1\right)}{x^2}$

$log2\left(x^6\sqrt{\frac{y}{z^5}}\right)$