| 3 |
| sin220° |
| 1 |
| cos220° |
=
(
| ||||
| sin220°cos220° |
=
4(
| ||||||||||||
|
=
| 4sin40°sin80° | ||
|
=32cos40°+64•
| 1−cos40° |
| 2 |
=32
求值：3/sin220°−1/cos220°+64sin220°．
求值：
−
+64sin220°．
| 3 |
| sin220° |
| 1 |
| cos220° |
数学人气：407 ℃时间：2020-03-29 22:21:44
优质解答
=
=
=
=32cos40°+64•
=32
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