// AngleTheta returns the angle theta between Vector A and Vector B using the dot product
func AngleTheta(vectorA ct.Vector, vectorB ct.Vector) (float64, error) {
normA := vectorA.Norm()
normB := vectorB.Norm()
if normA == 0 || normB == 0 {
return nil, errors.New("Either Vector A or Vector B is the zero vector")
}
dotProduct, err := InnerProduct(vectorA, vectorB)
if err != nil {
return nil, err
}
theta := math.Acos(dotProduct / (normA * normB))
return theta
}
