vlib/math: Add a pure V backend for vlib/math (#11267)

vlib/math/invtrig.js.v

@@ -0,0 +1,33 @@
+module math
+
+fn JS.Math.acos(x f64) f64
+
+fn JS.Math.asin(x f64) f64
+
+fn JS.Math.atan(x f64) f64
+
+fn JS.Math.atan2(y f64, x f64) f64
+
+// acos calculates inverse cosine (arccosine).
+[inline]
+pub fn acos(a f64) f64 {
+	return JS.Math.acos(a)
+}
+
+// asin calculates inverse sine (arcsine).
+[inline]
+pub fn asin(a f64) f64 {
+	return JS.Math.asin(a)
+}
+
+// atan calculates inverse tangent (arctangent).
+[inline]
+pub fn atan(a f64) f64 {
+	return JS.Math.atan(a)
+}
+
+// atan2 calculates inverse tangent with two arguments, returns the angle between the X axis and the point.
+[inline]
+pub fn atan2(a f64, b f64) f64 {
+	return JS.Math.atan2(a, b)
+}