$$\log4\left(4xy\right)^3$$

$$\left(x+3+a\right)^2$$

$$-2\cdot\left(-3\right)-\left(1+4\right)$$

$$3\left(-11\right)^4-3\left(-11\right)^3-\left(-11\right)^2+3\left(-11\right)-1\:$$

$$-6+30x+75$$

$$2x+y=90$$

$$\int\frac{x+2}{2x^2-1}dx$$