[R] d, p, q, r - What are the math relations with each other of this functions?

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Hi all,

Using the exponential distribution to exemplify: The dexp function is
the PDF (1) and pexp is the CDF (2), that is obtained integrating the
PDF. How can I get the qexp and the rexp? Considering that I have the
PDF, how this two are mathematically related to the PDF?

(1) ke^{-kx}
(2) 1-e^{kx}

Thanks in advance.