Calculus

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calculus = the type of mathematics that deals with rates of change, for example in the slope of a curve or the speed of a falling object 

decimal = based on or counted in tens or tenths 

subset = a smaller group of things formed from the members of a larger group 

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.