In an argumentative essay the author must use a formal and academic tone, to persuade the reader according to the evidence found to support his argument.
What is an argumentative essay?
It is a textual genre by which the author defends his ideas supported by concrete facts and evidence from reliable sources to create greater reliability.
Therefore, the argumentative essay is a style used to write scientific and academic articles, and the use of a formal tone is essential for adherence and reflection on the ideas proposed by the author.
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