$$36b^2-24b-16$$

$$\frac{343x^9+m^3}{7x^3-m^2}$$

$$\left(5a^2b-8\right)\left(5a^2b+8\right)$$

$$\left(7x^6+10y^7\right)^2$$

$$\csc^2x\left(\cos^2x\right)=1$$

$$8x\:+\:y\:+\:z\:+\:u\:+\:-3x\:-4y\:-2z\:+3u+4x\:+\:5y\:+\:3z\:-4u\:\:\:+9x\:+\:y\:+z\:+\:2u.$$

$$\tan\left(270-x\right)=\cot$$