$\frac{5x+2}{7x^2}+\frac{8x+2}{7x^2}$

$2x^2y^n\left(4y^{n+2}-1\right)$

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

$\lim_{x\to5}\left(\frac{x-5}{\left(x-2\right)^2}\right)$

$sin\left(2\pi\right)$

$3a^3+6a^2+9a$

$5\left(5x+4y\right)\:\:\left(5x-4y\right)$