$$f^1\left(2\right)$$

$$u-3,7<-9,6$$

$$y^2+\left(\frac{5y}{25}\right)+10$$

$$\left(-4\right)\cdot\left(-9\right)\cdot\left(-10\right)$$

$$30a^2bx-4ab^2y$$

$$\lim_{t\to0}\left(\frac{-1-\sqrt{1+4atx}}{2at}\right)$$

$$\frac{d^4}{dx^4}\left(\frac{x}{\left(1+x\right)}\right)$$