Give that man a cigar!
Sines and cosines have a life unto themselves -- you can't just define them out of existence. Pity the poor kid who learned "Divine Proportions" in high school, with no clue that he's about to get a very rude awakening in Freshman Calculus.
yeah...
thankfully I had some very good math teachers. I just looked through my Calc book and it's full of this Trig crap. I hope I can get it right.