$$\frac{11}{20}x-\frac{7}{10}>\frac{1}{5}+\frac{7}{20}x$$

$$\int_{\frac{y}{2}}^{a-\frac{y}{2}}\left(k\right)dy$$

$$\frac{1}{1-\cos\left(x\right)}-\frac{1}{1+\cos\left(x\right)}=\frac{2}{\sin\left(x\right)^2}$$

$$\left(15m^8+7n^3\right)\left(15m^8-7n^3\right)$$

$$\int\left(\frac{e^u}{\left(6-e^u\right)}\right)du$$

$$\frac{d}{dx}\left(t^9\cos\left(t\right)\right)$$