$\frac{\left(a+b\right)^3+\left(b+c\right)^3+\left(a+c\right)^3}{abc}$

$\frac{4}{x-4}-\frac{1}{x+7}$

$5-\log8x=2$

$5x-11y-9+20x-1-y$

$-18x^2-60x-50$

$\int\frac{x}{\left(x^2+a^2\right)^{\frac{3}{2}}}dx$

$cos\left(x\right)=sec\left(x\right)-sec\left(x\right)\left(sin\left(x\right)\right)^2$