doctest for trac 13097

Author: DaveWitteMorris

src/sage/symbolic/expression.pyx

@@ -12497,6 +12497,11 @@ cdef class Expression(CommutativeRingElement):
             (x, y) |--> 2*x + 2*y
             sage: integral(f, z)
             (x, y) |--> (x + y)*z
+
+        We check that :trac:`13097` is resolved::
+
+            sage: integrate(ln(1+4/5*sin(x)), x, -3.1415, 3.1415)  # tol 10e-6
+            -1.40205228301000
         """
         from sage.symbolic.integration.integral import \
             integral, _normalize_integral_input