$\left(csc\left(x\right)-cot\left(x\right)\right)\left(1+cos\left(x\right)\right)$

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

$\int xe^{1-kx}dx$

$3ax-bx-3ay+by$

$\left(x+10\right)\left(x-5\right)$

$x^2-\frac{5}{2}x$

$2x^2-4x+20-x^2+2xy+y^2$