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The cosine (cos) function gives a value -1 ≤ cos(x) ≤ 1 for any real x
e is a constant approximately equal to 2.7
therefore, by the rules of algebraic inequalities:
-1 ≤ cos(x) ≤ 1
-e ≤ ecos(x) ≤ e
also,
e < 3
therefore:
-e ≤ ecos(x) ≤ e < 3
-e ≤ ecos(x) < 3
which gives:
ecos(x) < 3
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