sin²30°+cos²30°-tan²45°

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sin²30°+cos²30°-tan²45°
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sin²30°+cos²30°-tan²45°
sin²30°+cos²30°-tan²45°

sin²30°+cos²30°-tan²45°
sin²30°+cos²30°-tan45°
=(1/4)+(3/4)-1
=1-1
=0