$x^3-3x^2+4$

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

$x^2-y=0$

$2x-6y\sqrt{x^2+1}\frac{dy}{dx}=0$

$\frac{d^2y}{dx^2}\left(x^2-2y\right)\left\{\right\}$

$\frac{\tan\left(x\right)+\cot\left(x\right)^2}{\sec\left(^2\right)x+\csc\left(^2\right)x}$

$-4^3b^2$