$\frac{4}{5}\:+\:\frac{2}{10}\:=\:$

$z+6\ge-4$

$\left(\sec^2x-1\right)\csc\left(x\right)$

$11d+5f-21d+5-8$

$\int\frac{x}{\:x^2+2x+3}dx$

$\pi+0$

$\lim_{x\to\infty}\left(\left(e^{-1.11x}\cdot\left(0.0078cos\left(6.165\right)x+sen\left(6.165\right)x\right)\right)-0.0078cos\left(2x\right)+0.062sen\left(2t\right)\right)$