document.write( "Question 1148547: find the exact values of x in the interval [0, 4π] that satisfy the equation.
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Algebra.Com's Answer #769880 by ikleyn(52790)\"\" \"About 
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document.write( "They are  \"pi%2F4\",  \"3pi%2F4\",  \"9pi%2F4\"  and  \"11pi%2F4\".\r\n" );
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