$\lim_{x\to2}\left(\frac{x^2-4}{\frac{1}{x^2}-\frac{1}{\:4}\:}\right)$

$58,029\cdot362$

$\left(mn^6\right)\left(-12m^7n^5\right)\left(-8m^6n^3\right)$

$\frac{-3sin^2x-3cos^2x}{cos^2x}$

$3q^2-12q=0$

$5x+4<-6$

$\lim_{x\to\frac{x}{2}}\left(5cos\left(-7x\right)sec\left(9x\right)\right)$