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.
答
(1)AB=
=13;
AC2+BC2
(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