Index: src/java/org/apache/poi/ss/formula/FormulaParser.java
===================================================================
--- src/java/org/apache/poi/ss/formula/FormulaParser.java	(revision 1174350)
+++ src/java/org/apache/poi/ss/formula/FormulaParser.java	(working copy)
@@ -121,7 +121,7 @@
 
 	private ParseNode _rootNode;
 
-	private static char TAB = '\t';
+	private final static char TAB = '\t';
 
 	/**
 	 * Lookahead Character.
@@ -229,7 +229,7 @@
 
 	/** Recognize White Space */
 	private static boolean IsWhite( char c) {
-		return  c ==' ' || c== TAB;
+		return  c ==' ' || c== TAB || c == '\r' || c == '\n';
 	}
 
 	/** Skip Over Leading White Space */
Index: src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationWorkbook.java
===================================================================
--- src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationWorkbook.java	(revision 1174350)
+++ src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationWorkbook.java	(working copy)
@@ -34,8 +34,6 @@
 import org.apache.poi.xssf.model.IndexedUDFFinder;
 import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTDefinedName;
 
-import java.util.HashMap;
-
 /**
  * Internal POI use only
  *
@@ -147,26 +145,12 @@
 	public Ptg[] getFormulaTokens(EvaluationCell evalCell) {
 		XSSFCell cell = ((XSSFEvaluationCell)evalCell).getXSSFCell();
 		XSSFEvaluationWorkbook frBook = XSSFEvaluationWorkbook.create(_uBook);
-		String formulaText = cleanXSSFFormulaText(cell.getCellFormula());
-		return FormulaParser.parse(formulaText, frBook, FormulaType.CELL, _uBook.getSheetIndex(cell.getSheet()));
+		return FormulaParser.parse(cell.getCellFormula(), frBook, FormulaType.CELL, _uBook.getSheetIndex(cell.getSheet()));
 	}
 
     public UDFFinder getUDFFinder(){
         return _uBook.getUDFFinder();
     }
-    
-   /**
-    * XSSF allows certain extra textual characters in the formula that
-    *  HSSF does not. As these can't be composed down to HSSF-compatible
-    *  Ptgs, this method strips them out for us.
-    */
-   private String cleanXSSFFormulaText(String text) {
-      // Newlines are allowed in XSSF
-      text = text.replaceAll("\\n", "").replaceAll("\\r", "");
-      
-      // All done with cleaning
-      return text;
-   }
 
 	private static final class Name implements EvaluationName {
 
Index: src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFBugs.java
===================================================================
--- src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFBugs.java	(revision 1174350)
+++ src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFBugs.java	(working copy)
@@ -622,7 +622,7 @@
     /**
      * Newlines are valid characters in a formula
      */
-    public void test50440() throws Exception {
+    public void test50440And51875() throws Exception {
        Workbook wb = XSSFTestDataSamples.openSampleWorkbook("NewlineInFormulas.xlsx");
        Sheet s = wb.getSheetAt(0);
        Cell c = s.getRow(0).getCell(0);
@@ -631,10 +631,16 @@
        assertEquals(3.0, c.getNumericCellValue());
        
        FormulaEvaluator formulaEvaluator = wb.getCreationHelper().createFormulaEvaluator();
-       formulaEvaluator.evaluateFormulaCell(c);
+       formulaEvaluator.evaluateFormulaCell(c);
        
        assertEquals("SUM(\n1,2\n)", c.getCellFormula());
        assertEquals(3.0, c.getNumericCellValue());
+
+       // For 51875
+       Cell b3 = s.getRow(2).getCell(1);
+       formulaEvaluator.evaluateFormulaCell(b3);
+       assertEquals("B1+B2", b3.getCellFormula()); // The newline is lost for shared formulas
+       assertEquals(3.0, b3.getNumericCellValue());
     }
     
     /**