Evaluate the following:
$$\frac{{\cos 2\theta \cdot \cos 3\theta - \cos 2\theta \cdot \cos 7\theta + \cos \theta \cdot \cos 10\theta }}{{\sin 4\theta \cdot \sin 3\theta - \sin 2\theta \cdot \sin 5\theta + \sin 4\theta \cdot \sin 7\theta }}$$

A. 0 B. 3 C. 2 D. 1

A. 2 B. $$\sqrt {13} $$ C. $$\sqrt {15} $$ D. 1

A. x = -y B. x > y C. x = y D. x < y

A. 2 B. 3 C. $$\frac{1}{2}$$ D. 1