-
倒数关系
tan
α
·cot
α
=
1
sin
α
·csc
α
=
1
cos
α
·sec
α
=
1
商数关系
tan
α
=sin
α
/cos
α
cot
p>
α
=cos
α
/s
in
α
平方关系
sin
< br>α
?+cos
α
?=1
p>
1+tan
α
?=sec
< br>α
?
1+cot
α
=csc
α
?
以下关系,函数名不变,符号看象限
sin
(
2k
π
+
α
)=
sin
< br>α
cos
(
2k
π
+
α
< br>)
=cos
α
tan
(
2k
π
+
α
)
=tan
α
cot
(
2k
π
+
α
)
=cot
α
sin
(
π
+
α
)
=-
sin
α
cos
< br>(
π
+
α
)
=-cos
α
tan
(
π
+
α
)
=tan
α
cot
(
π
+
α
)
=cot
α
sin
p>
(
π
-
α
)
=sin
α
p>
cos
(
π
-
p>
α
)
=-cos
α
tan
(
π
-
α
)
=-
tan
α
cot
< br>(
π
-
α
)
=-cot
α
sin
(
2
π
-
α
)=
-sin
α
cos
(
2
π
-
α
)=
cos
α
tan
(
< br>2
π
-
α
)=
-tan
α
cot
(
2
π
-
α
)=
-cot
α
以下关系,奇变偶不变,符号看象限
sin
(90°
-
α
)
=cos
α
cos
(90°
-
α
p>
)
=sin
α
tan
(90°
-
α
)
=cot
α
< br>
cot
(90°
-
α
)
=tan
α
sin
(9
0°+
α
)
=cos
< br>α
cos
(90°+
α
)
=sin
α
p>
tan
(90°+
α
)
=-cot
α
-
-
-
-
-
-
-
-
-
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