$\int x\left(-12x^{10}+33x^5-10x^2+12\right)dx$

$-2x^2+2x+1=0$

$c\left(x+y+z\right)-\left(x+y+z\right)$

$\lim_{t\to0}\left(\frac{2sin\left(3t^9\right)}{-5t}\right)$

$\int_{-2x^4}^x\left(\frac{1}{\sqrt{t+1}}\right)dt$

$cos\left(2x\right)-0.8$

$2\left\{2-3\left[3-2\left(-2\right)+3\left(-2\right)\right]2-1\right\}-3\left(4-5\right)$