Question: Prove property (9). u x v|| = ||u| |sin 0, where 0 is the angle between u and v. (9)

Prove property (9). 

u x v|| = ||u| |sin 0, where 0 is the angle between u and v. (9)

u x v|| = ||u| |sin 0, where 0 is the angle between u and v. (9)

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