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

$$\left(2xy\:-\:6\right)\left(2xy\:+6\right)$$

$$-4+\frac{5x}{\sqrt{900^2+x^2}}$$

$$\tan\left(90-x\right).\cos\left(90-x\right)-\sin\left(90-x\right)$$

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

$$\left(a^{n+1}+a^{n+1}\right)^2$$

$$\int\frac{\left(x^2+6\right)}{5x}dx$$