$7x+8\:\:7x+6\:$

$\frac{\left(1+\cos\left(x\right)\right)}{\sin\left(x\right)}+\tan\left(x\right)=\frac{\left(1+\cos\left(x\right)\right)}{\sin\left(x\right)\cdot\cos\left(x\right)}$

$\left(2x+y\right)^2-\:\left(2x-y\right)^2$

$\frac{2x^5+6x^4+2x^2-33x+10}{x-4}$

$4x-3+x=12$

$\int2b\sqrt{b-1}dx$

$\lim_{x\to\infty}\left(\frac{1}{4}\right)^x$