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Apply chain rule (#529)
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Apply chain rule (#529)
Use
d
y
d
x
=
d
y
d
u
⋅
d
u
d
x
\frac{dy}{dx} = \frac{dy}{du} \cdot \frac{du}{dx}
d
x
d
y
=
d
u
d
y
⋅
d
x
d
u
.