作业帮tan²30°+cos²30°-sin²45°tan45°
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tan²30°+cos²30°-sin²45°tan45°
tan²30°+cos²30°-sin²45°tan45°
tan²30°+cos²30°-sin²45°tan45°
tan²30°+cos²30°-sin²45°tan45°
=(√3/3)²+(√3/2)²-(√2/2)²×1
=1/3+3/4-1/2
=7/12
=(√3/3)²+(√3/2)²-(√2/2)²×1
=1/3+3/4-1/2
=7/12