$10-4.2$

$\frac{x+5}{\sqrt[5]{5+10}}$

$-6-2\left(-3-2\right)$

$\int\left(\frac{2x}{\left(x-1\right)\cdot\left(x^2+4\right)^2}\right)$

$\left(x^2\:z^3+2xy^2\:z^2\:\right)^5$

$-16\left(4\left(-8.2+4\left(5\right)-3+16\left(2.8\right)-4\right)\right)$

$\frac{1}{sec^2\left(a\right)}=sen^2\left(a\right).\cos^2\left(a\right).\cos^4\left(a\right)$