feat: add math/base/special/cosd

stdlib-js · Mar 9, 2024 · 9c9e2e4 · 9c9e2e4
1 parent b3ec0e3
commit 9c9e2e4
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/lib/node_modules/@stdlib/math/base/special/cosd/lib/main.js b/lib/node_modules/@stdlib/math/base/special/cosd/lib/main.js
@@ -52,7 +52,11 @@ var isInteger = require( '@stdlib/math/base/assert/is-integer' );
 function cosd( x ) {
 	var xRad;
 
-	if (isInteger(((x / 90) + 1) / 2) || Infinity < x || -Infinity > x) {
+	if (x === Infinity || x === -Infinity) {
+		return NaN;
+	}
+
+	if (isInteger(((x / 90) - 1) / 2)) {
 		return 0;
 	}