Derivative of $$$e^{x} \sin{\left(x \right)}$$$

The calculator will find the derivative of $$$e^{x} \sin{\left(x \right)}$$$, with steps shown.

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Your Input

Find $$$\frac{d}{dx} \left(e^{x} \sin{\left(x \right)}\right)$$$.

Solution

Apply the product rule $$$\frac{d}{dx} \left(f{\left(x \right)} g{\left(x \right)}\right) = \frac{d}{dx} \left(f{\left(x \right)}\right) g{\left(x \right)} + f{\left(x \right)} \frac{d}{dx} \left(g{\left(x \right)}\right)$$$ with $$$f{\left(x \right)} = e^{x}$$$ and $$$g{\left(x \right)} = \sin{\left(x \right)}$$$:

$${\color{red}\left(\frac{d}{dx} \left(e^{x} \sin{\left(x \right)}\right)\right)} = {\color{red}\left(\frac{d}{dx} \left(e^{x}\right) \sin{\left(x \right)} + e^{x} \frac{d}{dx} \left(\sin{\left(x \right)}\right)\right)}$$

The derivative of the exponential is $$$\frac{d}{dx} \left(e^{x}\right) = e^{x}$$$:

$$e^{x} \frac{d}{dx} \left(\sin{\left(x \right)}\right) + \sin{\left(x \right)} {\color{red}\left(\frac{d}{dx} \left(e^{x}\right)\right)} = e^{x} \frac{d}{dx} \left(\sin{\left(x \right)}\right) + \sin{\left(x \right)} {\color{red}\left(e^{x}\right)}$$

The derivative of the sine is $$$\frac{d}{dx} \left(\sin{\left(x \right)}\right) = \cos{\left(x \right)}$$$:

$$e^{x} \sin{\left(x \right)} + e^{x} {\color{red}\left(\frac{d}{dx} \left(\sin{\left(x \right)}\right)\right)} = e^{x} \sin{\left(x \right)} + e^{x} {\color{red}\left(\cos{\left(x \right)}\right)}$$

Simplify:

$$e^{x} \sin{\left(x \right)} + e^{x} \cos{\left(x \right)} = \sqrt{2} e^{x} \sin{\left(x + \frac{\pi}{4} \right)}$$

Thus, $$$\frac{d}{dx} \left(e^{x} \sin{\left(x \right)}\right) = \sqrt{2} e^{x} \sin{\left(x + \frac{\pi}{4} \right)}$$$.

Answer

$$$\frac{d}{dx} \left(e^{x} \sin{\left(x \right)}\right) = \sqrt{2} e^{x} \sin{\left(x + \frac{\pi}{4} \right)}$$$A


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