$-28-\left(-21\right)$

$\left(x\right)\left(x^{\frac{2}{3}}\right)$

$\left(\frac{1}{2}x+y\right)\left(2x+3y\right)$

$\left(m-\frac{a}{7}\right)^3$

$\frac{d^4}{dx^4}\left(\sin\left(xy\right)-\cos\left(xy\right)\right)$

$-4\sin^4\left(x\right)\cos^3\left(x\right)+2\cos\left(x\right)\sin\left(x\right)+2x+c$

$\int_{0.4}^{0.7}74xdx$