I used to know this. Now I forgot.

MAN!

now all i can do is square root of (x2-x1)2 - (y2-y1)2 and silly geometery like that.
[ Posted comic does not exist ]
yes I know thats not really "trig"

Be sure to post a series when you get sex education. Oh, and make one about learning the alphabet.

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Dad was flammable

What, you mean like...
[Click to view comic: 'how it all hapenned']