$5x^4-3x^2+2x^2+6x$

$4\left(6-x\right)-4\left(-7-12x\right)$

$\lim_{x\to0}\left(\frac{1-\cos\left(x^2\right)}{x^2\sin\left(x^2\right)}\right)$

$\left[-20\right]\cdot0$

$\int sin\left(\frac{x}{2}\right)\cdot sin\left(nx\right)dx$

$log2\left(log2\left(log2x\right)\right)=0$

$6x^2dx-2dy=0$