$\frac{\cos\left(x\right)+\cos\left(x\right)\cot\left(x\right)}{\sin\left(x\right)+\cos\left(x\right)}$

$\int\left(2x+1\right)\left(x^2+x+1\right)^3dx$

$-4\left(-4\right)\cdot\left(-3\right)$

$1-\frac{a^4}{9}$

$\frac{16x^2y^2z}{4x^2y^2}$

$\frac{dy}{dx}+\frac{5}{x}y=\frac{2x}{x}$

$x+y\cdot1$