[backport] doc/tut3.rst: Fix typo in Introduction (#12607) [ci skip]
Derivative of `b*pow(x, 2)` is `2*b*x`, while old version had `2*a*x`
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@ -28,7 +28,7 @@ Examples of things that can be implemented in macros:
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* Symbolic differentiation of an expression.
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``diff(a*pow(x,3) + b*pow(x,2) + c*x + d, x)`` is converted to
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``3*a*pow(x,2) + 2*a*x + c``
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``3*a*pow(x,2) + 2*b*x + c``
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Macro Arguments
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