$\left(ab\right)^{18}00$

$4a^2+24a+37=0$

$\left(1-\cos x\right)\left(1+secx\right)=sinxtanx$

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

$12^{11}\cdot12^{-10}$

$\sin\left(\frac{\pi}{6}\right)\cos\left(\frac{\pi}{4}\right)-\cos\left(\frac{\pi}{6}\right)\sin\left(\frac{\pi}{4}\right)$

$7-x\ge5$