$\left(3x+1\right)\left(x-2\right)+ax+b=3x^2+8x-5$

$\left(x+y+c^3\right)\left(x+y-c^3\right)$

$\lim_{x\to\infty}\left(1+\frac{12}{x}\right)^{\frac{x}{1}}$

$cot^2x=3$

$\frac{d}{dx}\left(x+e^{\left(x^2y^3\right)}\right)$

$20-\left(-5\right)-\left(-7\right)$

$\int\left(4x^4+12x^2+9\right).5x.dx$