SOLUTION: Hi, please help me solve this problem: Is this true of false: If alpha and beta are in standard position and cos alpha equals cos beta, then alpha and beta must be coterminal.

SOLUTION: Hi, please help me solve this problem: Is this true of false: If alpha and beta are in standard position and cos alpha equals cos beta, then alpha and beta must be coterminal.

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Question 395392: Hi, please help me solve this problem:
Is this true of false: If alpha and beta are in standard position and cos alpha equals cos beta, then alpha and beta must be coterminal.
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
Not necessarily true. On the unit circle, the cosine is represented by the x-coordinate. For example, , and have the same x-coordinate, and thus the same cosine value. However they are not co-terminal.
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