问题
填空题
sin40o(tan10o-
|
答案
sin40o(tan10o-
)=3
=sin40°(sin10°-
cos10°)3 cos10°
=2sin40°sin(10°-60°) cos10° -2sin40°cos40° cos10°
=
=-1，-sin80° cos10°
故答案为-1．
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sin40o(tan10o-
|
sin40o(tan10o-
)=3
=sin40°(sin10°-
cos10°)3 cos10°
=2sin40°sin(10°-60°) cos10° -2sin40°cos40° cos10°
=
=-1，-sin80° cos10°
故答案为-1．