$-11\cdot\left(9\right)+4\cdot7$

$\ln\sqrt{9}-2x^2$

$\lim_{x\to0}\frac{ln\left(\frac{sen\left(x\right)}{x}\right)}{x^2}$

$\int_0^{\frac{\pi}{4}}\left(\frac{\tan\left(x\right)^2}{\cos\left(x\right)^2}\right)dx$

$d^2+2d^2-13d+10$

$\left(2x+7\right)\left(3y\right)$

$\left(-1\right)^{n-1}\left(\frac{x^n}{n}\right)$