$$\frac{7^5x\:7^3}{7^2}$$

$$\lim_{x\to-1}\left(-2x^3-3\right)$$

$$-5\cdot\left(-2+6\right)+2\left(-3+5\right)$$

$$\int\left(\sin x^{\frac{1}{2}}\right)\cos xdx$$

$$\frac{dy}{dx}+y^2cos\left(2x\right)=0$$

$$\frac{16}{2}-3$$

$$7\left(2a^4-3a^3+5a^2\right)$$