$\lim_{x\to\pi}\left(\frac{1+\cos\left(x\right)}{sin\left(7x\right)}\right)$

$\frac{a}{s+2}+\frac{\left(bs+c\right)}{s^2+4s+5}$

$\frac{\left(-18x^5+18x^{\frac{1}{2}}-5x^{\frac{2}{3}}\right)}{3}$

$2\log\left(x\right)=2\log\left(x+1\right)$

$\int\frac{x^2}{\sqrt{6x-4}}dx$

$81a^2-36ab+4b^2$

$-2+3a-4b+b-a$