$$^{\circ}\:\:\left(\:x\:\:-\:\:1\right)\:\:\left(x\:\:+\:5\right)$$

$$b^3.b^7.b^{12}$$

$$\lim_{x\to0}\frac{5\sin\left(x\right)\left(1-\cos\left(x\right)\right)}{7x^2}$$

$$\left(13x+3y\right)^2$$

$$\frac{1}{16}y\left(y^2-9\right)$$

$$\left(5x^2\:y^3\:z\right)^2$$

$$3x\left(2x^2\right)^3$$