题目内容
在Rt△ABC中,∠C=90°,a,b,c分别是∠A,∠B,∠C的对边.
(1)若a=2,b=4,则tanA=______,cotA=______.
(2)若c=
a,则A的正切值为______.
(1)若a=2,b=4,则tanA=______,cotA=______.
(2)若c=
3 |
(1)tanA=
=
=
,cotA=
=2.
(2)设a=x,则c=
x,b=
=
x,
∴tanA=
=
=
.
a |
b |
2 |
4 |
1 |
2 |
4 |
2 |
(2)设a=x,则c=
3 |
c2-a2 |
2 |
∴tanA=
a |
b |
x | ||
|
| ||
2 |
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