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Yes if it was not practical it was not there. You can see the real life use on this link http://www.intmath.com/Applications-differentiation/Applications-of-differentiation-intro.php
classification of inorganic pharmaceuticals based on their applications and therapeutic uses
Applications
Differentiation is used to find the slope of lines/graphs, tangents, velocity functions, acceleration functions, finding relative extrema, absolute extrema, and alot of applicable uses.
Flerovium hasn't applications.
differentiation.
difference, different, differentiate, differential, differentiation.
Diamonds, optical fiber...
they are no uses
Sexual reproduction uses less tissue
Armors and ammunitions
it helps for to have better sex with you