一组扩充的表处理函数

(defun chgnth (i v l) 表换元素,用V替换表L中第I个元素

(defun carnth (i l) 表取头,保留表L前面I-1个元素

(defun cdrnth (i l) 表取尾,去除表L后面I个元素

(defun delnth (i l) 删除表L第I个元素

三角函数

(defun tan (v / u) (setq u (cos v)) (if (/= u 0) (/ (sin v) u)))

(defun ctan (v / u) (setq u (sin v)) (if (/= u 0) (/ (cos v) u)))

(defun sec (v / u) (setq u (sin v)) (if (/= u 0) (/ 1 u)))

(defun csc (v / u) (setq u (cos v)) (if (/= u 0) (/ 1 u)))

(defun asin (v) (atan v (sqrt (- 1 (* v v)))))

(defun acos (v) (- (/ pi 2) (asin v-Expanded list processing functions the (defun chgnth (ivl)　statement for elements with elements V substitution table L I (defun carnth (il)　take the head table reserved table L front I-1 elements (defun cdrnth (il)　table take the tail, remove the the Table L behind I elements (the defun delnth (il)　delete table L I-elements　trigonometric functions (defun tan (v/u) (setq u (cos v)) (if (/ = u 0) (/ (sin v) u))) (defun ctan (v/u) (setq u (sin v)) (if (/ = u 0) (/ (cos v) u) )) (defun sec (v/u) (setq u (sin v)) (if (/ = u 0) (/ 1 u))) (defun csc (v/u) (setq u (cos v)) ( if (/ = u 0) (/ 1 u))) (defun asin (v) (atan v (sqrt (- 1 (* vv))))) (defun acos (v) (- (/ pi 2) ( asin v)))