Question: Why does Maple not use the +C at the end of an indefinite integral solution?

We're starting on indefinite integrals in my 1st year calculus class.


A quick example would be int(sin(x), x);=-cos(x)+C


Maple doesn't add the +C on the end of it's solution. Can someone explain or point me to a resource? I've tried searching but I can't find an answer. 

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