sin²25°+tan55°*tan35°+cos²25°-tan²30°
=sin²25°+cos²25°+tan55°*tan35°-tan²30°
=1+tan55°*tan35°-tan²30°
=1+cot35°*tan35°-tan²30°
=1+1-tan²30°
=2-1/3
=5/3
计算sin²25°+tan55°*tan35°+cos²25°-tan²30°
1个回答
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