$$\log_{\frac{1}{3}}\left(x\right)=-4$$

$$20x^2+13x+2$$

$$\csc\:\left(18^{\circ\:\:\:}-2x\right)=\frac{1}{\sin\:\left(3x-42^{\circ\:\:\:\:}\right)}$$

$$\lim_{x\to7}\left(x^2-12x+35\right)ln\left|x-7\right|$$

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

$$\left(x-8\right)\left(x-3\right)$$

$$\cos\left(x\right)=\frac{\sqrt{5}}{3}$$