Update math_differential_calculus.ipynb

[zuhairabid]

Just to make the eqn. more clear in the graph

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[ageron]

Hi @zuhairabid ,
Thanks for your PR! The animate_tangent() function is used in another place with another function, so we can't hard-code y=f'(x)=2x in the function itself. However, I like the idea, so perhaps we could instead have an extra argument fp_str for this function, with default value None, and if it's not None then we use the title "y=f'(x)=" + fp_str.
What do you think?