$4x^2-8x+1$

$\left(\frac{0.05562}{-0.156}\right)-1\cdot100$

$\frac{2x^2-6x}{x+4}$

$x^2+4x+y=0$

$25x^2-40x$

$\sec\left(x\right)^2-\csc\left(x\right)^2+\cot\left(x\right)^2=\tan\left(x\right)^2$

$\lim_{x\to\infty}\left(\frac{ln\left(\sqrt{x}\right)}{ln\:10}\cdot\frac{ln10}{ln\:300x}\right)$