document.write( "Question 1089899: Find the domain:\r
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Algebra.Com's Answer #704415 by ikleyn(52787)\"\" \"About 
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document.write( "The correct answer is\r\n" );
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document.write( "    The domain of the given function is the union of all semi-intervals  \"n%2Api\" <= x < \"n%2Api+%2B+pi%2F2\",  for all integer n.\r\n" );
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document.write( "    Each semi-interval includes its left endpoint and excludes its right endpoint.\r\n" );
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