When $\cos (x) = 1$ ,
What does $x$ equal to?

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Solution

Use trigonometry to solve the equation:
When $\cos (x) = 1$
The value of $x$ is $0 and 2 π$
Therefore, The general value of $x$ can be $n π$ Where $n$ is an even number.
Hence, the value of $x$ is $n π$ where n is an even number.

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