From 956e98498d3bac8354366f50571501352c9869a6 Mon Sep 17 00:00:00 2001
From: JPZEBRA <zebra@wing.plala.or.jp>
Date: Thu, 27 May 2021 07:15:49 +0900
Subject: [PATCH] Revise Accuracy

arcsin revised
---
 lib/FloatedBigDigit32.cpp | 34 ++++++++++++++++++++++------------
 lib/FloatedBigDigit32.h   |  2 +-
 2 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/lib/FloatedBigDigit32.cpp b/lib/FloatedBigDigit32.cpp
index 1947842..6e2d3ea 100644
--- a/lib/FloatedBigDigit32.cpp
+++ b/lib/FloatedBigDigit32.cpp
@@ -1,6 +1,6 @@
 /* FLOATED BIG DIGIT CLASS */
 /* CREATE  2021.02.06      */
-/* REVISED 2021.05.26      */
+/* REVISED 2021.05.27      */
 /* Ver 0.9.6               */
 /* Original by K-ARAI      */
 
@@ -4178,28 +4178,38 @@ int FloatedBigDigit32::SetAsin_boost(FloatedBigDigit32* V) {
     FloatedBigDigit32* F = new FloatedBigDigit32();
     FloatedBigDigit32* A = new FloatedBigDigit32();
     FloatedBigDigit32* B = new FloatedBigDigit32();
+    FloatedBigDigit32* C = new FloatedBigDigit32();
+
+    bool rf = V->minus;
 
     F->Copy(V);
+    F->Abs();
 
-    A->Copy(V);
-    A->Mul(V);
-    A->sub(1);
-    A->Sig();
+    A->set(1);
+    A->Sub(F);
 
-    B->set(2);
-    A->PowerDiv(B);
-    A->add(1);
+    B->set(1);
+    B->Add(F);
 
-    F->Div(A);
+    C->set(2);
+    A->PowerDiv(C);
+    B->PowerDiv(C);
 
-    this->SetAtan_boost(F);
-    this->mul(2);
+    A->Mul(B);
+    int ret = C->SetAsin(A);
+
+    this->SetPI();
+    this->div(2);
+    this->Sub(C);
+
+    this->minus = rf;
 
     delete F;
     delete A;
     delete B;
+    delete C;
 
-    return floatedBigDigitERR;
+    return ret;
 
 }
 
diff --git a/lib/FloatedBigDigit32.h b/lib/FloatedBigDigit32.h
index a174401..5f51623 100644
--- a/lib/FloatedBigDigit32.h
+++ b/lib/FloatedBigDigit32.h
@@ -1,6 +1,6 @@
 /* FLOATED BIG DIGIT CLASS */
 /* CREATE  2021.02.06      */
-/* REVISED 2021.05.26      */
+/* REVISED 2021.05.27      */
 /* Ver 0.9.6               */
 /* Original by K-ARAI      */