$2\left(ab\right)^6\left(3ab^4\right)^3$

$3-\left[-2-\left(-5+8\right)\:\right]+\left(-1\right)$

$\left(e^x+1\right)dy=\:\left(y-ye^x\right)dx$

$cosa=\frac{1}{2}$

$\left(cos\left(y\right)-ycos\left(x\right)\right)dx-\left(sen\left(x\right)+xsen\left(y\right)\right)dy=0$

$-1x-8$

$28m^2-13m-6$