$9x=27$

$\lim_{x\to0}\frac{\sqrt{1+2x}-\sqrt{1-4x}}{x}$

$\left(4c+1\right)^2$

$\int_{-\infty}^{-64}\left(\frac{1}{1+x^2}\right)dx$

$\lim_{x\to\frac{\pi}{4}}\left(\frac{4tan\left(x\right)-4cot\left(x\right)}{x-\frac{\pi}{4}}\right)$

$\left(3w\right)\left(+3w\right)\left(-16w\right)$

$cscx\left(tanx+cosx\right)=\:secx+cotx$