# Find the Domain f(x) equals sec(two x)

Set the argument in equal to to find where the expression is undefined.

, for any integer

Divide each term in by .

The common factor should be canceled of .

Cancel the common factor.

Divide by .

First, multiply .

Multiply and .

First, multiply by .

The domain is all values of that make the expression defined.

Set-Builder Notation:

, for any integer

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