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@lae
Try soaking the crank arm overnight in penetrating oil (Duck Oil is by far the best, WD40 will do in a pinch though). They're really stuck on sometimes. Leave the bike on its side and fill up the taper hole completely with oil.
Or you could remove the crank bolt and ride around for a few hours to loosen it up. Might come off while you're riding though, which would be a Very Bad Thing.