$2cos^2x=1-cosx$

$x^2y^'+2xy=x-1$

$\int\frac{20x^2-60x+46}{\left(x+2\right)\left(2x-5\right)\left(x-1\right)}dx$

$\int\frac{1-2x-x^2}{x^3-x}dx$

$\left(3x^2-6x+8\right).\left(2x-5\right)$

$1+\frac{2sin\left(x\right)cos\left(x\right)}{sin\left(x\right)+cos\left(x\right)}=sin\left(x\right)+cos\left(x\right)$

$\left(-42\right)\left(-30\right)$