如图,在Rt△ABC中,∠C=90°,AC=12,BC=5 (1)求AB的长; (2)求sinA,cosA,tanA,sinB,cosB,tanB的值.

问题描述:

如图,在Rt△ABC中,∠C=90°,AC=12,BC=5 

(1)求AB的长;
(2)求sinA,cosA,tanA,sinB,cosB,tanB的值.

(1)AB=

AC2+BC2
=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