$$\sqrt{25a^4b^6c^{10}}$$

$$\lim_{x\to1}\left(\frac{\sqrt{2x+1}-3}{x^2-16}\right)$$

$$-7x<42$$

$$\left(3x\:-\:1\right)\left(a\:+\:3b\right)\:$$

$$\frac{1-cos\left(x\right)}{1+cos\left(x\right)}=\frac{sec\left(x\right)-1}{sec\left(x\right)+1}$$

$$17x+8x^2+404$$

$$-\left(5x-9y-32\right)$$