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

$\left(9a+7b^6\right)\left(81a^2-63ab^6+49^{12}\right)$

$\lim_{x\to\infty}\left(\frac{x-1}{x+1}\right)^{2x+1}$

$\int\:\frac{3+\ln\:\left(x\right)}{x}dx$

$-\frac{200}{100}$

$5x^2+4y^2-3x+2x^2+2y+4x^2-1$

$\left(y-1\right)\left(x-1\right)$