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CHANGELOG.md

@@ -4811,6 +4811,7 @@ A total of 29 people contributed to this release. Thank you to the following con
 
 <details>
 
+-   [`377403b`](https://github.com/stdlib-js/stdlib/commit/377403b1ecb696a54e038b8750efd09481fe3ba0) - **test:** add missing tests for `math/base/special/cosd` [(#2418)](https://github.com/stdlib-js/stdlib/pull/2418) _(by Gunj Joshi)_
 -   [`c88dbaa`](https://github.com/stdlib-js/stdlib/commit/c88dbaaf68dd67dc5bdd7bb71ef9ed4ad01ef42a) - **test:** add missing tests for `math/base/special/tand` [(#2417)](https://github.com/stdlib-js/stdlib/pull/2417) _(by Gunj Joshi)_
 -   [`a50d33d`](https://github.com/stdlib-js/stdlib/commit/a50d33db8b44799d80958be0403f1315389b9c7c) - **feat:** add C implementation for `math/base/special/haversin` [(##2408)](#2408) _(by Gunj Joshi)_
 -   [`1ea46e9`](https://github.com/stdlib-js/stdlib/commit/1ea46e990236941d977d6dc872ba0475eab366e8) - **docs:** use correct function name in example in `math/base/special/hacoversin` [(##2409)](#2409 ) _(by Gunj Joshi)_

base/special/cosd/test/test.js

@@ -108,3 +108,9 @@ tape( 'if provided `-infinity`, the function returns `NaN`', function test( t )
 	t.equal( isnan( v ), true, 'returns NaN' );
 	t.end();
 });
+
+tape( 'if provided `90.0`, the function returns `0.0`', function test( t ) {
+	var v = cosd( 90.0 );
+	t.equal( v, 0.0, 'returns expected value' );
+	t.end();
+});

base/special/cosd/test/test.native.js

@@ -117,3 +117,9 @@ tape( 'if provided `-infinity`, the function returns `NaN`', opts, function test
 	t.equal( isnan( v ), true, 'returns expected value' );
 	t.end();
 });
+
+tape( 'if provided `90.0`, the function returns `0.0`', opts, function test( t ) {
+	var v = cosd( 90.0 );
+	t.equal( v, 0.0, 'returns expected value' );
+	t.end();
+});