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Homework Statement
I don't know if I'm posting in the right area, but here is the question:
From the inequality: la dot bl= lal lbl lcos(theta)l is less than or equal to lal lbl
Deduce the triangle inequality:
la + bl is less than or equal to lal +lbl
Homework Equations
The Attempt at a Solution
I am not even sure where to begin :(
I'm wondering if I could use numbers to prove it, but that doesn't seem right.