$\lim_{x\to0}\left(\frac{\cos\left(x\right)sin\left(x\right)}{x^2}\right)$

$\frac{\cot\left(-x\right)}{\csc\left(x\right)}=-\cos\left(x\right)$

$\frac{\left(7-3x\right)+\left(2+4\right)}{x}$

$\left(a^4b^{-1}\right)^{-2}\left(a^{-3}b\right)^2$

$3x+9>54$

$\int\left(7x-5\right)^{12}dx$

$\lim_{x\to4}\left(\frac{\sqrt[2]{x}-4}{x-4}\right)$