Textbook Question
In Exercises 1–10, use substitution to determine whether the given x-value is a solution of the equation.
__
√ 2 𝝅
cos x = ------- , x = ------
2 4
12
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Find all solutions to the equation.
cosx=1
x=0
x=2πn
x=π+2πn
x=2π+2πn,x=23π+2πn