$\frac{\left(4m^2n\right)}{2m^5n}^2$

$x-4-2x+1$

$\frac{1+cos^4\left(x\right)}{cos^2\left(x\right)}$

$-7+-4+-1+2$

$\left(3a-2\right)\left(3a-1\right)$

$\left(\tan\left(\frac{4}{3}\pi\right)\left(\sin\left(\frac{4}{3}\pi\right)\right)\right)$

$\int2\left(2+x^2\right)^2xdx$