Add simplification rules for calcFunc-sec, calcFunc-csc, calcFunc-cot.

1 files changed, 39 insertions, 0 deletions

diff --git a/lisp/calc/calc-units.el b/lisp/calc/calc-units.el
index e8a3abfe958..4b3c284ddad 100644
--- a/lisp/calc/calc-units.el
+++ b/lisp/calc/calc-units.el
@@ -1241,6 +1241,45 @@ Entries are (SYMBOL EXPR DOC-STRING TEMP-TYPE BASE-UNITS).")
               (eq (nth 1 (nth 2 rad)) 'rad)
               (list 'calcFunc-tan (nth 1 rad))))))
 
+(math-defsimplify calcFunc-sec
+  (and math-simplifying-units
+       (math-units-in-expr-p (nth 1 math-simplify-expr) nil)
+       (let ((rad (math-simplify-units
+                   (math-evaluate-expr
+                    (math-to-standard-units (nth 1 math-simplify-expr) nil))))
+             (calc-angle-mode 'rad))
+         (and (eq (car-safe rad) '*)
+              (math-realp (nth 1 rad))
+              (eq (car-safe (nth 2 rad)) 'var)
+              (eq (nth 1 (nth 2 rad)) 'rad)
+              (list 'calcFunc-sec (nth 1 rad))))))
+
+(math-defsimplify calcFunc-csc
+  (and math-simplifying-units
+       (math-units-in-expr-p (nth 1 math-simplify-expr) nil)
+       (let ((rad (math-simplify-units
+                   (math-evaluate-expr
+                    (math-to-standard-units (nth 1 math-simplify-expr) nil))))
+             (calc-angle-mode 'rad))
+         (and (eq (car-safe rad) '*)
+              (math-realp (nth 1 rad))
+              (eq (car-safe (nth 2 rad)) 'var)
+              (eq (nth 1 (nth 2 rad)) 'rad)
+              (list 'calcFunc-csc (nth 1 rad))))))
+
+(math-defsimplify calcFunc-cot
+  (and math-simplifying-units
+       (math-units-in-expr-p (nth 1 math-simplify-expr) nil)
+       (let ((rad (math-simplify-units
+                   (math-evaluate-expr
+                    (math-to-standard-units (nth 1 math-simplify-expr) nil))))
+             (calc-angle-mode 'rad))
+         (and (eq (car-safe rad) '*)
+              (math-realp (nth 1 rad))
+              (eq (car-safe (nth 2 rad)) 'var)
+              (eq (nth 1 (nth 2 rad)) 'rad)
+              (list 'calcFunc-cot (nth 1 rad))))))
+
 
 (defun math-remove-units (expr)
   (if (math-check-unit-name expr)