作业帮(cos55°+sin45°sin10°)/(sin55°-cos45°cos80°)＝?
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(cos55°+sin45°sin10°)/(sin55°-cos45°cos80°)＝?
(cos55°+sin45°sin10°)/(sin55°-cos45°cos80°)＝?
(cos55°+sin45°sin10°)/(sin55°-cos45°cos80°)＝?
(cos55°+sin45°sin10°)/(sin55°-cos45°cos80°)＝?
cos55°+sin45°sin10°
=cos(10°+45°)+sin45sin10
=cos10cos45-sin45sin10+sin45sin10
=cos10cos45
sin55-cos45cos80
=sin(10+45)-cos45cos80
=sin10cos45+sin45cos10-cos45cos80
=sin45cos10
sin45=cos45
∴原式=1
(cos55°+sin45°sin10°)/(sin55°-cos45°cos80°)＝?
sin10°cos35°+cos10°cos55°=
sin10°cos45°+sin80°cos55°
sin45°×cos60°+sin45°
sin45°+cos45°
sin45°=?
sin55°、cos55°、tan55°的大小关系是什么?
sin45°乘以cos60°+sin45° 等于多少?
根号8乘sin45°
sin10°^2+cos40°^2+sin10°sin40°
计算2sin10°+cos10°+tan20°sin10°
cos20°cos10°+sin10°sin10°
刚才的题目,为什么=|sin10°| =sin10°
Sin10°度等于多少
(1/sin10°)减(根号2/sin10°)=?(1/sin10°)减[(根号2)/sin10°]=?
sin10°是多少函数值
sin45°×cos45°-sin30°
sin45°+cos60°/In=