$$\frac{9^{2}}{25}-\frac{ab}{5}+\frac{1}{5}$$

$$\sin\left(-\frac{12}{13}\right)^2+\cos\left(x\right)^2=1$$

$$3^4\cdot3^{10}$$

$$\lim_{x\to\infty}\left(\frac{1}{\sqrt{1+\sqrt{\frac{1}{\sqrt{x}}}}}\right)$$

$$dy=\left(xy-3x\right)dx$$

$$6\left|x+1\right|+2\left|x-4\right|$$

$$\int\:dt$$