$$4x^2-13x^2+36$$

$$\int-6e^{cos\left(t\right)}sin\left(t\right)dt$$

$$\left(x^2+3xy\right)\left(5y+4x-18\right)$$

$$x^2+10x=36$$

$$2\left(-2\right)+4\left(-2\right)-6$$

$$\lim_{x\to2}\left(\frac{x-7}{\left(x-2\right)^2}\right)$$

$$\frac{d}{dx}\left(\frac{\left(7x^5cosx\right)}{\left(x-1\right)^{\frac{2}{3}}e^{x+1}}\right)$$