1. trigonométrie   geology   trigonometry   psychology   history   Hint Half-n-half Clue   2. biologie   chemistry   psychology   biology   philosophy   Half-n-half Clue   3. géographie   geography   physics   geology   philosophy   Half-n-half Clue   4. botanique   psychology   chemistry   botany   trigonometry   Half-n-half Clue   5. psychologie   psychology   trigonometry   philosophy   physics   Half-n-half Clue   6. calcu   calculus   history   geometry   zoology   Half-n-half Clue   7. géométrie   psychology   calculus   algebra   geometry   Half-n-half Clue