$4x^2+14x-2x-7+2x^2-10x+6$

$-14.6+-4$

$\sqrt{-3.\:\left(-8\right)+\left(-5\right)^2}$

$\lim_{x\to\frac{\pi}{2}}\left(\cos\left(x\right)\cdot ln\left(cosx\right)\right)$

$\frac{d}{dx}\left(8\cos\left(3x\right)^3\cdot e^{7x}\cdot\left(6x-10\right)^4\right)$

$4x-2+4x+2+4-3x$

$\frac{dy}{dx}=1+y^2+x+xy^2$