$\int_{-1}^{-3}\left(\frac{sen\left(\pi\:x\right)}{\pi\:}\right)dx$

$\left(-x^9\right)\left(-x^{9+2}\right)$

$345\cdot0.1$

$-12j\:-\:4k\:+\:5j\:+\:k$

$t^2-t+2-2$

$\left(7z^2-5y^2\right)^3\left(7z^2+5y^2\right)$

$\lim_{x\to0}\left(\frac{\ln\left(\sin\left(\pi x\right)\right)}{\ln\left(\sin\left(x\right)\right)}\right)$