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化简：(tan10°−
3
)•
cos10°
sin50°
．
人气：249 ℃　时间：2020-03-23 07:49:49
解答
(tan10°−
3
)•
cos10°
sin50°

=
(sin100−
3
cos100)•cos100
cos100•sin500

=
2(
1
2
sin100−
3
2
cos100)
sin500

=
2(sin100cos600−cos100sin600)
sin500

=
2sin(−500)
sin500
=-2
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