Observing nature is a human behavior, perceived since ancient times, necessary to
provide knowledge and evolution of humanity. Over the years, techniques and means
of specific description of nature were acquired, with the aim of providing man with
improvements in daily activities and well-being. Natural phenomena, such as rain,
are necessary to maintain life on earth, however, depending on their intensity, they
can cause damage, both to humanity and nature. The capital of Pará, Belém, has the
highest rainfall rates in the state of Pará, having an annual cycle of rainy and less
rainy periods, which sometimes cause inconvenience for the population, causing
flooding and damage to health. When dealing with means for describing preferences,
mathematical modeling is a research method that uses mathematical concepts to
produce tools that help in describing or making decisions about them. Linked to the
description of cyclical characteristics and mathematics, trigonometric functions are
mathematics study tools that behave by forming repetitions, commonly used to
describe cyclical characteristics. Therefore, in this work, a trigonometric function will
be used as a model to describe the behavior of precipitation in Belém, using data
from ten years, Mathematical modeling and R’studio software.
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