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A = 7/25
Satu sisi belum diketahui, maka
r = √25*-7*
r = √625-49
r = √576
r = 24
Maka, Cos A = 24/25
Mencari B
B = 3/5
Satu sisi belum diketahui, maka
r = √5*-3*
r = √25-9
r = √16
r = 4
Maka Sin B = 4/5
Jadi, Cos* A + Sin* B = (24/25)* + (4/5)* = (44/25)* = 1936/625 = 3 61/625