$$\frac{t-1}{t^4+6t^3+9t^2}$$

$$4^2+x^2-2\cdot4\cdot x$$

$$3xyz+5xyz$$

$$2y^2+c=-x+c$$

$$\int\left(\frac{4}{\left(t+9\right)^4}\right)dt$$

$$5sin\left(x+53.13^{\circ\:}\right)=1$$

$$\lim_{x\to36}\left(\frac{36-x}{6-\sqrt{x}}\right)$$