- Show that
cosθ=(u⋅v)/(|u||v|)for 2D vectors u and v.
(it is quite hard to come up with these challenges, so if you got any ideas, please post them)
this post was submitted on 25 May 2024
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Daily Maths Challenges
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Here's a rly cool solution from stackexchange, which blows my average geometric solution out of the water
spoiler