$$\int e^{-t}\cos\pi tdt$$

$$\frac{a^{12}}{a^7}$$

$$subtract\:65\:from\:\left(-80\right)$$

$$1+\cot^2\cdot20=\csc^2\cdot20$$

$$\frac{12x^3+13x^2-59x+30}{x-5}$$

$$\left(\sin\left(x\right)-\cos\left(x\right)\right)^2+2$$

$$2xyz-4xyz2$$