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-rw-r--r--calc_test.go1
1 files changed, 1 insertions, 0 deletions
diff --git a/calc_test.go b/calc_test.go
index 47cd806..5822135 100644
--- a/calc_test.go
+++ b/calc_test.go
@@ -491,6 +491,7 @@ func TestCalcCellValue(t *testing.T) {
// COS
"=COS(0.785398163)": "0.707106781467586",
"=COS(0)": "1",
+ "=-COS(0)": "-1",
"=COS(COS(0))": "0.54030230586814",
// COSH
"=COSH(0)": "1",