tableau de valeurs x cos(pi/x) 1 -1 2 6.1232339957368E-17 3 0.5 4 0.70710678118655 5 0.80901699437495 6 0.86602540378444 7 0.90096886790242 8 0.92387953251129 9 0.93969262078591 10 0.95105651629515

facture détaillée h.t taux t.v.a. t.t.c.. 22 5.50 1.21 23.21 32.50 19.60 6.37 38.87 80.00 19.60 15.68 95.68 319.00 19.60 62.524 381.524