$\lim_{x\to-\infty}\sqrt{2x^2+4}-\sqrt{5x^2-5}$

$\sin\left(2x\right)-\tan\left(x\right)\cos\left(x\right)=\tan\left(x\right)$

$2x^2.-3x$

$\left(9+x\right)ln4=3\left(x-3\right)ln4$

$01x^2+182x+91$

$\int\frac{x^2+8}{x\left(x^2+16\right)}dx$

$cos\left(-x\right).csc\left(-x\right)sec\left(x\right)$