- #1

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But I heard that cos(x) is not closed function in R.

What do I choose closed set A in R, cos(A) is not closed in R?

Help....

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- Thread starter emptyboat
- Start date

- #1

- 21

- 0

But I heard that cos(x) is not closed function in R.

What do I choose closed set A in R, cos(A) is not closed in R?

Help....

- #2

quasar987

Science Advisor

Homework Helper

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- #3

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Thank you, friend. I tried closed intervals...

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