$\int\:\frac{1}{\left(a-x\right)\left(b-x\right)}dx$

$\sqrt{4-2\left(0\right)+\left(0\right)^2}-0$

$53=\arctan\left(\frac{x}{50}\right)$

$\left(-0.7-1.275i\right)^2$

$15:\left(-7+2\right)$

$6x+8y-2x-y$

$\left(\frac{5}{2}x^2y^2-\frac{4}{3}x^4+7\right)\left(\frac{6}{7}x^2y^2+\frac{9}{8}\right)y^4$