rename vercos to coversin

The code to compute 1 - sin(x) belongs to coversin, not vercos.

help/Makefile

@@ -203,33 +203,33 @@ DETAIL_HELP= abs access acos acosh acot acoth acsc acsch address agd \
 	append appr arg argv arrow asec asech asin asinh assign atan atan2 \
 	atanh avg base base2 bernoulli bit blk blkcpy blkfree blocks bround \
 	btrunc calc_tty calclevel calcpath catalan ceil cfappr cfsim char \
-	cmdbuf cmp comb conj cos cosh cot coth count cp csc csch ctime d2dm \
-	d2dms d2g d2r delete den dereference det digit digits display dms2d dp \
-	epsilon errcount errmax errno error estr euler eval exp fact factor \
-	fclose fcnt feof ferror fflush fgetc fgetfield fgetfile fgetline fgets \
-	fgetstr fib files floor fopen forall fpathopen fprintf fputc fputs \
-	fputstr frac free freebernoulli freeeuler freeglobals freeredc \
-	freestatics frem freopen fscan fscanf fseek fsize ftell g2d g2gm g2gms \
-	g2r gcd gcdrem gd getenv gms2g h2hm h2hms hash head highbit hmean \
-	hms2h hnrmod hypot ilog ilog10 ilog2 im indices inputlevel insert int \
-	inverse iroot isalnum isalpha isassoc isatty isblk iscntrl isconfig \
-	isdefined isdigit iserror iseven isfile isgraph ishash isident isint \
-	islist islower ismat ismult isnull isnum isobj isobjtype isodd isprime \
-	isprint isptr ispunct isqrt isrand israndom isreal isrel issimple \
-	isspace issq isstr istype isupper isxdigit jacobi join lcm lcmfact \
-	lfactor ln log log2 logn lowbit ltol makelist matdim matfill matmax \
-	matmin matsum mattrace mattrans max memsize meq min minv mmin mne mod \
-	modify name near newerror nextcand nextprime norm null num oldvalue \
-	ord param perm pfact pi pix places pmod polar poly pop popcnt pound \
-	power prevcand prevprime printf prompt protect ptest push putenv quo \
-	quomod r2d r2g rand randbit random randombit randperm rcin rcmul rcout \
-	rcpow rcsq re remove reverse rewind rm root round rsearch runtime \
-	saveval scale scan scanf search sec sech seed segment select sgn sha1 \
-	sin sinh size sizeof sleep sort sqrt srand srandom ssq stoponerror str \
-	strcasecmp strcat strcmp strcpy strerror strlen strncasecmp strncmp \
-	strncpy strpos strprintf strscan strscanf strtolower strtoupper substr \
-	sum swap system systime tail tan tanh test time trunc usertime vercos \
-	versin version xor
+	cmdbuf cmp comb conj cos cosh cot coth count coversin cp csc csch \
+	ctime d2dm d2dms d2g d2r delete den dereference det digit digits \
+	display dms2d dp epsilon errcount errmax errno error estr euler eval \
+	exp fact factor fclose fcnt feof ferror fflush fgetc fgetfield \
+	fgetfile fgetline fgets fgetstr fib files floor fopen forall fpathopen \
+	fprintf fputc fputs fputstr frac free freebernoulli freeeuler \
+	freeglobals freeredc freestatics frem freopen fscan fscanf fseek fsize \
+	ftell g2d g2gm g2gms g2r gcd gcdrem gd getenv gms2g h2hm h2hms hash \
+	head highbit hmean hms2h hnrmod hypot ilog ilog10 ilog2 im indices \
+	inputlevel insert int inverse iroot isalnum isalpha isassoc isatty \
+	isblk iscntrl isconfig isdefined isdigit iserror iseven isfile isgraph \
+	ishash isident isint islist islower ismat ismult isnull isnum isobj \
+	isobjtype isodd isprime isprint isptr ispunct isqrt isrand israndom \
+	isreal isrel issimple isspace issq isstr istype isupper isxdigit \
+	jacobi join lcm lcmfact lfactor ln log log2 logn lowbit ltol makelist \
+	matdim matfill matmax matmin matsum mattrace mattrans max memsize meq \
+	min minv mmin mne mod modify name near newerror nextcand nextprime \
+	norm null num oldvalue ord param perm pfact pi pix places pmod polar \
+	poly pop popcnt pound power prevcand prevprime printf prompt protect \
+	ptest push putenv quo quomod r2d r2g rand randbit random randombit \
+	randperm rcin rcmul rcout rcpow rcsq re remove reverse rewind rm root \
+	round rsearch runtime saveval scale scan scanf search sec sech seed \
+	segment select sgn sha1 sin sinh size sizeof sleep sort sqrt srand \
+	srandom ssq stoponerror str strcasecmp strcat strcmp strcpy strerror \
+	strlen strncasecmp strncmp strncpy strpos strprintf strscan strscanf \
+	strtolower strtoupper substr sum swap system systime tail tan tanh \
+	test time trunc usertime versin version xor
 
 # This list is of files that are clones of DETAIL_HELP files.  They are
 # built from DETAIL_HELP files.