$3y-2x-3x-\left\{x-\left[y-\left(2-x\right)\right]-2x\right\}$

$\lim_{x\to0}\left(\frac{1+\ln\left(1+x\right)-e^{x}}{x^{2}}\right)$

$\left(25x^4y^{\frac{4}{3}}\right)^{\frac{3}{2}}$

$\frac{1+\tan\:^2\left(80\right)}{\sec\:2\left(80\right)}=1$

$z^2+4z-4$

$\int\left(12\left(x^4+4x^2+6\right)^2\left(x^3+2x\right)\right)dx$

$-2\left(0\right)^2+3$