# Derivative of $$$2 u$$$

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### Your Input

**Find $$$\frac{d}{du} \left(2 u\right)$$$.**

### Solution

**Apply the constant multiple rule $$$\frac{d}{du} \left(c f{\left(u \right)}\right) = c \frac{d}{du} \left(f{\left(u \right)}\right)$$$ with $$$c = 2$$$ and $$$f{\left(u \right)} = u$$$:**

**Apply the power rule $$$\frac{d}{du} \left(u^{n}\right) = n u^{n - 1}$$$ with $$$n = 1$$$, in other words, $$$\frac{d}{du} \left(u\right) = 1$$$:**

Thus, $$$\frac{d}{du} \left(2 u\right) = 2$$$.

### Answer

**$$$\frac{d}{du} \left(2 u\right) = 2$$$A**