(1)AB=
A C 2 +B C 2 =13;
(2)sinA=
BC
AB =
5
13 ,
cosB=
BC
AB =
5
13 ,
tanA=
BC
AC =
5
12 ,
sinB=
AC
AB =
12
13 ,
cosA=
AC
AB =
12
13 ,
tanB=
AC
BC =
12
5 .
(1)AB=
A C 2 +B C 2 =13;
(2)sinA=
BC
AB =
5
13 ,
cosB=
BC
AB =
5
13 ,
tanA=
BC
AC =
5
12 ,
sinB=
AC
AB =
12
13 ,
cosA=
AC
AB =
12
13 ,
tanB=
AC
BC =
12
5 .