diff --git a/src/PhpSpreadsheet/Calculation/Engineering.php b/src/PhpSpreadsheet/Calculation/Engineering.php
index 6f1fd2a5..2be5c50f 100644
--- a/src/PhpSpreadsheet/Calculation/Engineering.php
+++ b/src/PhpSpreadsheet/Calculation/Engineering.php
@@ -2016,7 +2016,7 @@ class Engineering
         $parsedComplex = self::parseComplex($complexNumber);
 
         $theta = self::IMARGUMENT($complexNumber);
-        if ($theta === functions::DIV0()) {
+        if ($theta === Functions::DIV0()) {
             return '0';
         }
 
diff --git a/src/PhpSpreadsheet/Chart/Renderer/JpGraph.php b/src/PhpSpreadsheet/Chart/Renderer/JpGraph.php
index 9834f608..98baab85 100644
--- a/src/PhpSpreadsheet/Chart/Renderer/JpGraph.php
+++ b/src/PhpSpreadsheet/Chart/Renderer/JpGraph.php
@@ -4,6 +4,7 @@ namespace PhpOffice\PhpSpreadsheet\Chart\Renderer;
 
 use PhpOffice\PhpSpreadsheet\Chart;
 use PhpOffice\PhpSpreadsheet\Settings;
+use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
 
 class JpGraph
 {
@@ -846,6 +847,8 @@ class JpGraph
 
     /**
      * Create a new jpgraph.
+     *
+     * @param Chart $chart
      */
     public function __construct(Chart $chart)
     {