$50\cdot80$

$6z^2+z-2$

$\frac{tan\left(x\right)}{cot\left(x\right)}+\frac{tan\left(z\right)}{\cot\left(z\right)}$

$\int_{-1}^0\left(\ln\left(x\right)\right)dx$

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

$-8\left(2\right)^4\left(-4\right)^2$

$9,8-4,5$