refactor: precompute constant

---
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---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/cosine/stdev/lib/main.js

@@ -21,8 +21,11 @@
 // MODULES //
 
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
-var sqrt = require( '@stdlib/math/base/special/sqrt' );
-var PI_SQUARED = require( '@stdlib/constants/float64/pi-squared' );
+
+
+// VARIABLES //
+
+var STDEV_CONST = 0.36151205519132795; // sqrt( (1/3) - (2/π²) )
 
 
 // MAIN //
@@ -62,7 +65,7 @@ function stdev( mu, s ) {
 	) {
 		return NaN;
 	}
-	return s * sqrt( ( 1.0/3.0 ) - ( 2/PI_SQUARED ) );
+	return s * STDEV_CONST;
 }
 
 

lib/node_modules/@stdlib/stats/base/dists/cosine/stdev/manifest.json

@@ -39,9 +39,7 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/binary",
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt",
-        "@stdlib/constants/float64/pi-squared"
+        "@stdlib/math/base/assert/is-nan"
       ]
     },
     {
@@ -57,9 +55,7 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/assert/is-nan",
-        "@stdlib/constants/float64/eps",
-        "@stdlib/math/base/special/sqrt",
-        "@stdlib/constants/float64/pi-squared"
+        "@stdlib/constants/float64/eps"
       ]
     },
     {
@@ -75,9 +71,7 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/assert/is-nan",
-        "@stdlib/constants/float64/eps",
-        "@stdlib/math/base/special/sqrt",
-        "@stdlib/constants/float64/pi-squared"
+        "@stdlib/constants/float64/eps"
       ]
     }
   ]

lib/node_modules/@stdlib/stats/base/dists/cosine/stdev/src/main.c

@@ -18,8 +18,8 @@
 
 #include "stdlib/stats/base/dists/cosine/stdev.h"
 #include "stdlib/math/base/assert/is_nan.h"
-#include "stdlib/math/base/special/sqrt.h"
-#include "stdlib/constants/float64/pi_squared.h"
+
+static const double STDLIB_COSINE_STDEV_CONST = 0.36151205519132795; // sqrt( (1/3) - (2/π²) )
 
 /**
 * Returns the standard deviation for a raised cosine distribution with location `mu` and scale `s`.
@@ -40,5 +40,5 @@ double stdlib_base_dists_cosine_stdev( const double mu, const double s ) {
 	) {
 		return 0.0/0.0; // NaN
 	}
-	return s * stdlib_base_sqrt( ( 1.0/3.0 ) - ( 2/STDLIB_CONSTANT_FLOAT64_PI_SQUARED ) );
+	return s * STDLIB_COSINE_STDEV_CONST;
 }