Hello,
-->
(for more comfort)
--->
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The first term will use the product rule since there are y and z in it, considering x as a constant and y as the variable.
Thus the derivative of the first term will be :
The red dots correspond to the derivative of yz. We have to use the product rule.
--->
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Now considering the second term
We have to use the product rule too.
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Now, the third term, z.
Its derivative is z' (3)
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The derivative of the whole thing will be
And... I won't copy it, you can do it
I hope there is no mistake, check it again, it will make a good exercise