Respuesta :
The statement cos(-x) = -cosx is false becasue cos(-x) = cosx for all x the statement is false.
What is trigonometry?
Trigonometry is a branch of mathematics that deals with the relationship between sides and angles of a right-angle triangle.
We have:
Cos(-x)=-cosx
As we know, cos is the ratio of the side adjacent to the hypotenuse
x ∈ (-∞, ∞)
Take x = -30
cos(-30) = √3/2
cos30 = √3/2
cos(-x) = cosx for all x
Thus, the statement cos(-x) = -cosx is false becasue cos(-x) = cosx for all x the statement is false.
Learn more about trigonometry here:
brainly.com/question/26719838
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