Add regression test

Closes sympy/sympy#26566
skirpichev · May 8, 2024 · 181bd23 · 181bd23
1 parent 975e07c
commit 181bd23
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diff --git a/diofant/tests/integrals/test_integrals.py b/diofant/tests/integrals/test_integrals.py
@@ -1579,3 +1579,10 @@ def test_sympyissue_26504():
 
 def test_sympyissue_26506():
     integrate(log(x**2 + x - 1)**2/x**3, x)  # not raises
+
+
+def test_sympyissue_26566():
+    a = symbols('a', real=True, positive=True)
+
+    assert integrate(sin(a*(x + pi))**2,
+                     (x, -pi, -pi/2)) == (pi*a - sin(pi*a))/(4*a)
diff --git a/docs/release/notes-0.15.rst b/docs/release/notes-0.15.rst
@@ -104,3 +104,4 @@ These Sympy issues also were addressed:
 * :sympyissue:`26502`: lots of PolynomialError contains an element of the set of generators exceptions calling integrate in sympy 1.12
 * :sympyissue:`14069`: Condition for TODO in zeta_functions.py is now satisfied
 * :sympyissue:`25931`: Possible improvements in gruntz
+* :sympyissue:`26566`: wrong result integrating sin(a*(x+pi))**2