$7a-4b+5\:-7a+4a-6c$

$sen^2x\cdot sec^2x+cosx$

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

$\frac{x+2}{x-2}=\frac{2x+4}{x+1}$

$\left(3x\right)+\left(2y\right)^5$

$\left(2^2\right)+\left(6^2\right)$

$\left(\frac{\frac{1}{2}xy^2z}{\frac{3}{4}a^4m^2z^{10}}\right)$