$-8\:-\:\left(-20\right)$

$\lim_{x\to0}\left(5sin\left(2t\right)ln\left(2t\right)\right)$

$\left(3+x^6\right)\frac{dy}{dx}=\frac{x^5}{y}$

$2z+12$

$\left(6x^3+6\right)^3.\left(4x\right)^{5x}$

$\left(4a\right)\left(2a-9a^2+5a^3+3\right)$

$\sin\left(x\right)+\sin\left(-x\right)=0$