cos - I resulted in a negative answer. Why is it impossible for cos to be 12 negative?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 59E
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It is impossible for any trig function to result in a
negative answer.
2 is a positive angle, therefore the cosine of
any positive angle must be positive as well.
is bigger than 7, therefore it has to be a
positive answer.
is in the first quadrant and x values are
12
positive in the first quadrant, therefore cos
12
must be positive.
Transcribed Image Text:It is impossible for any trig function to result in a negative answer. 2 is a positive angle, therefore the cosine of any positive angle must be positive as well. is bigger than 7, therefore it has to be a positive answer. is in the first quadrant and x values are 12 positive in the first quadrant, therefore cos 12 must be positive.
cos -
I resulted in a negative answer.
Why is it impossible for cos to be
12
negative?
Transcribed Image Text:cos - I resulted in a negative answer. Why is it impossible for cos to be 12 negative?
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