$\left(b-\sqrt{2}\right)^2$

$\left(x^4+6x^3-4x^2-7x\right)\left(4x^3+6x^2-8x\right)$

$\lim_{x\to\infty}\left(\frac{x\ln\left(x+1\right)}{x^2+1}\right)$

$\lim_{x\to infinity}\left(\frac{3x+\sin\left(x\right)}{x}\right)$

$x^2-6x=72$

$\frac{d}{dx}\frac{10\tan^2x}{-b}$

$\left(+14\right)-\left(-12\right)$