$$\frac{dv}{dt}=\left(0.00018995\right)\cdot v^2$$

$$\left(7\right)^{-8}\left(7\right)^3$$

$$\int_0^{\pi}\left(6\sin\left(x\right)\right)dx$$

$$21\sin\left(-x\right)$$

$$x-y-2x+3y$$

$$\lim_{x\to0}\left(\frac{lnx}{x^2+1+9x}\right)$$

$$x^2-6=0$$