$$\lim_{x\to a}\left(x-\frac{\left|x-a\right|}{a-x}\right)$$

$$\int_1^2\sec\left(x\right)\tan\left(x\right)dx$$

$$\left(x^2-b^2\right)^3$$

$$11\left(x-3\right)+\frac{\left(x-3\right)^2}{2}+30\ln\left(x-3\right)$$

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

$$64m^{12}+125n^6$$

$$100.549^2$$