$\left(\sin a+\csc a\right)^2$

$\int\left(\left(x-1\right)\sqrt{8-x-x^2}\right)dx$

$15\:-\:\left(-4\right)\:$

$\lim_{x\to\infty}\left(\frac{\sqrt{x^7-2}}{x^6-1}\right)$

$4.8\cdot2^3$

$4x-8\ge2x-6$

$\lim_{x\to\frac{\pi}{6}}\left(\frac{\sin\left(x-\frac{\pi}{6}\right)}{\sqrt{3}-2\cos\left(x\right)}\right)$