Differentiation lets you find the rate of change of a function. You can use this to find the maximum or minimum values of a differentiable function, which is useful in a lot of optimization problems. It's also necessary for differential equations, which are useful just about everywhere.
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If you mean x squared + 9, you differentiate this as follows: Use the differentiation formula for a power, to differentiate the x squared. Separately, use the differentiation formula for a constant, to differentiate the 9. Finally, use the differentiation formula for a sum to add up the parts.
Differentiation of funtion is rate of chnage of that funtion.
integration is reverse of differentiation and vice versa
In people, differentiation occurs during the fetal development in the uterus.
( u(x+h) - u(x) )/ h