Wednesday, 24 July 2013

integration - What does it mean the notation intRleft(cosx,sinxright)mathrmdx

Sometimes I find this notation and I get confused:
R(cosx,sinx)dx



Does it mean a rational function or taking rational operations between cosx and sinx ?




Can you explain please?



Update: I think you did not understand the question well,
Here is an example (maybe it is a lemma or a theorem):




All the integrals of the form R(cosx,sinx)dx can be evaluated using the substitution
u=tanx2.





I think that R here does not stand for a rational function but for taking rational operations(addition, subtraction, multiplication, division) between cosx and sinx



Update : I did not noticed that R is a rational function of two variables and that means exactly that we are taking rational operations.

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