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

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

$$\frac{1}{\left(x+iy\right)\left(\left(x+iy\right)^2+8\right)}$$

$$\left(3x-6\right)\left(5x-7\right)-15x^2+51x$$

$$6mn+9m-3m+mn$$

$$\int\frac{3x^3+x}{\left(x+1\right)^2}dx$$

$$\int_{1}^{3}7xdx$$