$\frac{6x^6}{8x^4}$

$\int_1^{y^2}xdx$

$\frac{1}{\sqrt{2}\pi}e^{\left(-x^2\frac{1}{2}\right)}$

$\left(2mn-2n^2\right)^2$

$\frac{\left(2y\right)^{2}}{\left(2y^{6}\right)^{2}}$

$\frac{1}{1-sin^2x}=1+tan^2x$

$\left(10a+11b+3c\right)+\left(5a-6b-3c\right)-\left(2a-5c+2b\right)$