• 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)

  • siriusmart@lemmy.worldOPM
    2·
    5 months ago

    Here’s a rly cool solution from stackexchange, which blows my average geometric solution out of the water

    spoiler