题目内容
不查表求值:(
-tan5°)•
.
1 |
tan5° |
1 - cos20° | ||
|
(
-tan5°)•
=(
-
)•
=
•
=
•
=1.
故答案为:1.
1 |
tan5° |
1 - cos20° | ||
|
cos5° |
sin5° |
sin5° |
cos5° |
1 - cos20° | ||
|
=
cos10° |
sin10° |
1 - cos20° | ||||
|
cos10° |
sin10° |
1 - 1+2sin 210° |
sin20° |
故答案为:1.

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