Tangente inverse na grades (DRG: RAD → GRAD)
Bofina 
lisusu mpo na kolongwa na radians mpe kokende na grades. Likomi ya orange likolo ya tan ezali mpo na fonction inverse; yango wana bofina 
, nsima 
, bokoma 1, mpe bofina 
. Angle droit ezali 100 grades, yango wana eyano ezali 50.. Bofina mbala moko lisusu mpo na kozonga na degrés.