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map/libmap: remove unused function/definitions

--- a/sys/src/cmd/map/libmap/zcoord.c

+++ b/sys/src/cmd/map/libmap/zcoord.c

@@ -123,12 +123,6 @@

 		g->wlon.l += 2*PI;

 }

-double

-tan(double x)

-{

-	return(sin(x)/cos(x));

-}

-

 void

 printp(struct place *g)

 {

--- a/sys/src/cmd/map/map.h

+++ b/sys/src/cmd/map/map.h

@@ -7,8 +7,6 @@

 #define TWOPI (2*PI)

 #define RAD (PI/180)

-double	hypot(double, double);	/* sqrt(a*a+b*b) */

-double	tan(double);		/* not in K&R library */

 #define ECC .08227185422	/* eccentricity of earth */

 #define EC2 .006768657997

-- 

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