$$\int2x^24^{-3x}dx$$

$$\lim_{x\to0}\left(\frac{\left(\frac{1}{x}\right)}{sin\left(\frac{1}{x}\right)}\right)$$

$$5^2-a^2$$

$$4n^4+3n^2+n^2-6$$

$$\left(3x-2y\right)^2+8y\left(3x-2y\right)+16y^2$$

$$sin\left(x-\frac{\pi\:}{2}\right)=cosx\:$$

$$2x^2+5x+3=0$$