$z\:2+\:z\:w\:+\:2\:z\:+\:2\:w\:+\:z\:+\:w$

$\int\frac{1+\sin\left(x\right)}{\sin\left(x\right).2\cos\left(x\right)}dx$

$x^2-12x+24$

$-\log\left(10^{-7}\right)$

$\frac{1-sin^2\left(x\right)}{sin^2\left(x\right)}+sin^2\left(x\right)$

$\int\left(x^2-9\right)-\left(2x^2+5x-3\right)dx$

$\int\frac{1+x}{1+x^{2}}dx$