$$-2x+13>21-4x$$

$$135.89-23.56$$

$$\frac{\sin\left(d\right)}{\csc\left(d\right)}+\frac{\cos\left(d\right)}{\sec\left(f\right)}$$

$$3^{8^{1+1}}$$

$$5\left(-2\right)^2\left(-1\right)-8\left(3\right)\left(-\frac{1}{2}\right)$$

$$\left(\frac{e^{1+2x}\left(\frac{cy}{4}\right)}{ce}\right)$$

$$\lim_{x\to-1}\left(x^{-7}\right)$$