sin²60°+cos²60°、tan45°-si - 知识问答

sin²60°+cos²60°、tan45°-sin30°×cos60°、cos²45°/

1个回答

sin²60°+cos²60°
=3/4+1/4
=1
tan45°-sin30°×cos60°
=1-1/2×1/2
=3/4
cos²45°/tan²30°
=(1/2)/(1/3)
=3/2

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