$$12-\left|1-\left(-22+57\right)\right|$$

$$\left(2x+y-z\right)\left(2x+y+z\right)$$

$$\frac{a^4+2}{a^3}$$

$$5,776\:-\:\left(-7\right)\:$$

$$1-cos^2\left(2a\right)+tan^2\left(-2a\right)-4sin^2\left(a\right)cos^2\left(a\right)$$

$$\int\frac{e^x}{x^{-1}}dx$$

$$x^3-x^2+x^{-2}-5^2$$