$$3+6\cdot14$$

$$\left(3x-9y\right)\left(5z+3x\right)$$

$$t^2-8t+65$$

$$\left(4x^2-10\right)\left(5z^3-2z\right)$$

$$\lim_{x\to\infty}\left(9x^2e^{-x}\right)$$

$$\lim_{x\to0}\left(\frac{\left(x-1\right)^2}{\tan^3\left(x\right)-\:sen^3\left(x\right)}\right)$$

$$5xy-1=0$$