$\frac{\cot\left(-x\right)}{\csc\left(x\right)}=-\cos\left(x\right)$

$\frac{dy}{dx}+3=6$

$3\left(8-2x\right)+2\left(x-19\right)$

$\lim_{t\to0}\left(\frac{-4sin\left(5t^7\right)}{-3t}\right)$

$\lim_{x\to0}\left(\frac{2\cos x-2}{x^2}\right)$

$400\cdot3.1$

$1+2+3+4+w+2w+3w$