$$5x^2-10x-8x^2+x$$

$$2\left(x+y\right)\left(x^2+y^2\right)$$

$$\frac{d}{dx}\left(3ln\left(2x-7\right)+sinx^{cosx}\left(ln\left(sinx\right)\right)\right)$$

$$sin\:1.047$$

$$45y-9y+2$$

$$2x^3-2ax-x^5+2ax^3-x$$