Derivative of $$$y z$$$ with respect to $$$y$$$
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Your Input
Find $$$\frac{d}{dy} \left(y z\right)$$$.
Solution
Apply the constant multiple rule $$$\frac{d}{dy} \left(c f{\left(y \right)}\right) = c \frac{d}{dy} \left(f{\left(y \right)}\right)$$$ with $$$c = z$$$ and $$$f{\left(y \right)} = y$$$:
$${\color{red}\left(\frac{d}{dy} \left(y z\right)\right)} = {\color{red}\left(z \frac{d}{dy} \left(y\right)\right)}$$Apply the power rule $$$\frac{d}{dy} \left(y^{n}\right) = n y^{n - 1}$$$ with $$$n = 1$$$, in other words, $$$\frac{d}{dy} \left(y\right) = 1$$$:
$$z {\color{red}\left(\frac{d}{dy} \left(y\right)\right)} = z {\color{red}\left(1\right)}$$Thus, $$$\frac{d}{dy} \left(y z\right) = z$$$.
Answer
$$$\frac{d}{dy} \left(y z\right) = z$$$A
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