Enlarge the rectangle.
2 answers:
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Using the fact that cos is 2π-periodic, we have
That is, for any
and integer
.
We get 2 solutions in the interval [0, 2π] for and
,
Using the fact that cos is 2π-periodic, we have
That is, for any
and integer
.
We get 2 solutions in the interval [0, 2π] for and
,