From 2051eebdb1271db06b09b4236156136ccbcdbf84 Mon Sep 17 00:00:00 2001
From: James <james_g_k@hotmail.co.uk>
Date: Thu, 8 Feb 2018 10:46:01 +0000
Subject: [PATCH 1/2] fix atan264 for negative y and positive x

when y is negative and x is positive the output should be negative, this addresses both:
https://github.com/mmoller2k/Math64/issues/1
and
https://github.com/vtomanov/Gps64/issues/1
---
 Math64.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Math64.cpp b/Math64.cpp
index 255e08f..231ee03 100644
--- a/Math64.cpp
+++ b/Math64.cpp
@@ -172,7 +172,7 @@ f64 atan264(f64 y, f64 x)
   if(x.isZero() && !y.isNegative()) return pio2;	
   if(y.isNegative() && x.isNegative()) return atan64(y/x)-pio2*f64(2);
   if(x.isNegative()) return atan64(y/x)+pio2*f64(2); // y>=zero
-
+  if(y.isNegative() && !x.isNegative()) return -atan64(y/x);
   return atan64(y/x); // x>zero
 }
 

From 769cd0b7595430d663d58b67e8b73379652537f3 Mon Sep 17 00:00:00 2001
From: James <james_g_k@hotmail.co.uk>
Date: Thu, 8 Feb 2018 11:43:25 +0000
Subject: [PATCH 2/2] fix asin64 to return neg value with neg input

---
 Math64.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Math64.cpp b/Math64.cpp
index 231ee03..6be595d 100644
--- a/Math64.cpp
+++ b/Math64.cpp
@@ -156,6 +156,8 @@ f64 asin64(f64 z)
 	
   z=z/sqrt64(f64(1)-z*z);
 	
+  if (z<0)
+    return -atan64(z);
   return atan64(z);
 }