Question

For any vectors a, b, c $\mathbf{a} \times (\mathbf{b} + \mathbf{c}) + \mathbf{b} \times (\mathbf{c} + \mathbf{a}) + \mathbf{c} \times (\mathbf{a} + \mathbf{b}) =$

• A. 0
• B. $\mathbf{a} + \mathbf{b} + \mathbf{c}$
• C. $\mathbf{\lbrack abc\rbrack}$
• D. $\mathbf{a} \times \mathbf{b} \times \mathbf{c}$

Answer 1

Answer: (A)

0

Answer 2

It is obvious.