Diferentiation or Differentiation: How To spell?
The word Diferentiation is misspelled against Differentiation, a noun meaning "The act of differentiating."
Differentiation has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Di & erentiation which should not be misspelled with single 'F'
Wrong Spelling:  Di-f-erentiation  Correct Spelling:  Di-ff-erentiation 
Find more incorrect spellings of Differentiation to spell right way.