$$t2-7t+49$$

$$\frac{d^4}{dx^4}\left(\cos\left(2x\right)\right)-8x^4-4$$

$$\int z^3dz$$

$$sin\left(a+b\right)+sin\left(a-b\right)=2sinacosb$$

$$\int e^{at}\cdot\cos\left(nt\right)dt$$

$$\frac{x^2+x^2}{x+1}$$

$$\left(4x-9\right)\left(4x+6\right)$$