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I decided to cheat, and just use Pythagoras, and algebra / mathematics to do my calculation.
Not nearly as elegant as using the correct Trig function, but fuck it, while it may be a long way around the bend, I don't have do any real math research.
OH DEAR. THIS POST WAS SET TO SELF-DETONATE 💣 💥 🔥
Ą̷͇̀l̵̩̓̕l̸̩͘ ̸̭̪̈́ť̷̝̍̆h̶̡̛̰̯̏͌a̷͕̞͋̂t̵̩͙͑̈́͝'̵̛̍́ͅͅş̴̬̱͝ ̷̗̊͠l̵͚̕͠ē̸̻͓̐͝f̷̧͙̀̑͝t̶͓̓͊̚ ̶̜̱̓͌́a̴͉͊r̶̡̩͛̀é̵̦̞͕ ̶̮̾ṫ̷̡͈̍ḧ̸̛͍́̊e̴̫̅ş̶̥̰̓e̴̟̪͌͂̇ ̷̞̅͊̚h̷̰͕͈͂e̶̡̹̜̚ŗ̸̗͈̾̇e̴̩̍͐ ̷̪͉̩̀a̵̡̱̐͑͝s̴͎͖̈́h̸͈͌́͜e̴͕̝̐̌ś̶͓̆ͅ.̵̩̉ ̵̱͊͑̀