LISP 三角函數中度度量的書寫法

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Notepad++ Edit
(defun c:sT()
  ;三角函數中度度量的書寫法
  (setq a1 (getpoint "請用滑鼠點一點："))
  (setq s2 (sin (/ pi 2)))
  (princ "\nPI=")(princ pi)
  (princ "\ns2=(sin (/ pi 2))=")(princ s2)
  (setq s3 (sin (/ 3.1415927 2)))
  (princ "\nPI=")(princ pi)
  (princ "\ns3=(sin (/ 3.1415927 2))=")(princ s3)
  (princ "\n============================================\n")
  (setq Sx1 (sin (/ 3.1415927 1)))
  (princ "\nSx1=(sin (/ 3.1415927 1))=")(princ sx1)
    (princ "\n============================================\n")
  ;(setq Sx2 (sin (3.1415927))) 
  ;度度量如須運算用小括弧刮起來；否則純度度量(如上 sin (3.14.. )不可用刮弧刮起來
  (setq Sx2 (sin 3.1415927)) 
  (princ "\nSx2=(sin (3.1415927))=")(princ sx2)
  (princ "\n============================================\n")
  (setq s4 (sin (/ 1.57079635 1)))
  (princ "\nPI=")(princ pi)
  (princ "\ns4=(sin (1.57079635))=")(princ s4)  
  (prin1)
)