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

$y'\left(x\right)=\left(3\cdot y\right)+x+e^{\left(2\cdot x\right)}$

$2x+5\cdot4x-3$

$\left(-4\right)\left(-5\right)\left(-1\right)\left(-3\right)\left(-2\right)$

$\lim_{x\to\infty}\left(\frac{5x^3-3x+2}{1-3x^2}\right)$

$12.005\cdot2$

$3x^2-9x-12$