$\left(\frac{4a^{-4}b^{8}}{19a^{5}b^{-3}}\right)^{0}$

$1-\left(-3+6+1\right)-\left|4-\left(6-3+1\right)-2\right|$

$-16\cdot24$

$lncos2x$

$\int\frac{\ln\left(x\right)+1}{x\ln^2\left(x\right)}dx$

$\left(2b+6\right)\left(2b+20\right)$

$\frac{d^2}{dx^2}\left(6sqrt\left(x-1\right)\right)$