$$\left(2\right)\left(2\right)^3\left(2\right)^{-2}$$

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

$$3t-153\le-159$$

$$\frac{x-1}{2}\le3\:x\:-1\:$$

$$\int\:2x\left(x^2+5\right)^7dx$$

$$3n^2-8y+15+3$$

$$m^2-10m+21$$