basicdoc: major doc update

assets/disk0/home/basic/fn.bas

@@ -0,0 +1,9 @@
+10 DEFUN POW2(N)=2^N
+20 DEFUN DCOS(N)=COS(PI*N/180)
+30 FOR X=0 TO 8
+40 PRINT X,POW2(X)
+50 NEXT
+60 PRINT "----------------"
+70 FOREACH A=0!45!90!135!180!NIL
+80 PRINT A,DCOS(A)
+90 NEXT