Explore Westonci.ca, the premier Q&A site that helps you find precise answers to your questions, no matter the topic. Explore a wealth of knowledge from professionals across various disciplines on our comprehensive Q&A platform. Join our Q&A platform to connect with experts dedicated to providing accurate answers to your questions in various fields.

Proof the following properties of the cross products:
a. ×(×) = (⋅) − (⋅)
b. ‖u+v‖²= ‖u‖² ‖v‖²-‖u.v‖²