$$1-\left(-3\right)+\left(6-5+8\right)+\left(-3\right)+5$$

$$\int\left(sec\left(40w\right)tan\left(40w\right)\right)dw$$

$$\int x\left(2x^2+7\right)^9dx$$

$$\lim_{x\to n}\left(1+\frac{\left(1-a\right)y}{a\left(n-1\right)}\right)$$

$$\int\frac{2}{x^2\sqrt{9x^2-1}}dx$$

$$5x\:-\:2y\:+\:x\:-\:5\:+\:3y\:+\:2\:+\:2\left(-x\:-\:y\right)$$

$$\left(x+6\right)\left(x+2\right)+\left(x+4\right)\left(x+1\right)-2x^2$$