$\sin\left(x\right)\sin\left(2x\right)+2\:\left(\sin\left(x\right)^2\right)$

$\lim_{x\to2}\frac{3x^2}{4-x^2}$

$\frac{\left(24^{15}y^{16}\right)}{\left(8^6y^{10}\right)}$

$\left(5x-2\right)\left(7x+6\right)$

$60x+60=50x+90$

$5x^3y^2+45x^2+30x^2y$

$\frac{x^3-x^2+5x+1}{x-1}$