(math-do-integral-methods): Try linear, then non-linear, substitutions.

diff --git a/lisp/calc/calcalg2.el b/lisp/calc/calcalg2.el
index 7e8484ea79fe3b8d4b0c08ae2a561eea0c4cb886..ff23c3e542131fbe31e831420137835bfe2bf238 100644 (file)
--- a/lisp/calc/calcalg2.el
+++ b/lisp/calc/calcalg2.el
@@ -981,9 +981,8 @@
 
     ;; Integration by substitution, for various likely sub-expressions.
     ;; (In first pass, we look only for sub-exprs that are linear in X.)
-    (or (if math-linear-subst-tried
-           (math-integ-try-substitutions expr)
-         (math-integ-try-linear-substitutions expr))
+    (or (math-integ-try-linear-substitutions expr)
+        (math-integ-try-substitutions expr)
 
        ;; If function has sines and cosines, try tan(x/2) substitution.
        (and (let ((p (setq rat-in (math-expr-rational-in expr))))