$-\:\left(5\:-\:6\:+\:7\right)\:+\:\left[9\:+\:\left(3\:-\:2\:+\:7\left(3\right)\right)\:-\:-\:\left[3\:+\:8\:-\:5\:+\:\left(3\:-\:1\right)\right]\right]$

$\frac{1}{\left(1-x^3\right)}$

$ay-by$

$3y^4-2x^3y+4x^3-5y^4x+3;\:x=2;y=-1$

$-\frac{1}{3}ab\:\left(\frac{6}{7}a^{2\:}-\frac{9}{2}b^3+\frac{1}{6}ab\right)$

$\int_0^{\frac{\pi}{2}}\left(\frac{\sin\left(x\right)}{16+\cos\left(x\right)^2}\right)dx$

$2z-1\ge0$