$\frac{62.4m+\frac{1}{2}\left(-5.60\frac{m}{s^2}\right)\cdot\:4.20s^2}{4.20s^2}.$

$\ln\left(a+b\right)+4\ln\left(a-b\right)-5\ln c$

$\left(5a+2b\right)^2-\left(3a-7b\right)^2$

$-12\left(cos\left(x\right)\right)^2+3=-3$

$\frac{dy}{dx}x^{x-7}$

$\left(4m\:-\:9x\right)^2$

$\sqrt[3]{8a^4}+\frac{16}{4}a^3-2^3a^2$