[css-values-4] Specify CSSNumericValue/type of the new functions.

Author: tabatkins

css-values-4/Overview.bs

@@ -2827,6 +2827,15 @@ Type Checking</h3>
 	* The [=CSSNumericValue/type=] of a ''min()'', ''max()'', or ''clamp()'' expression
 		is the result of [=add two types|adding the types=]
 		of its comma-separated [=calculations=].
+	* The [=CSSNumericValue/type=] of a ''sin()'', ''cos()'', or ''tan()'' expression
+		is «[ "number" → 1 ]».
+	* The [=CSSNumericValue/type=] of an ''asin()'', ''acos()'', ''atan()'', or ''atan2()'' expression
+		is «[ "angle" → 1 ]».
+	* The [=CSSNumericValue/type=] of a ''pow()'' or ''sqrt()'' expression
+		is «[ "number" → 1 ]».
+	* The [=CSSNumericValue/type=] of a ''hypot()'' expression
+		is the result of [=add two types|adding the types=]
+		of its comma-separated [=calculations=].
 
 	For each of the above,
 	if the [=CSSNumericValue/type=] is failure,