1/cos80°(3/sin²40°-1/cos40°)=?
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1/cos80°(3/sin²40°-1/cos40°)=?1/cos80°(3/sin²40°-1/cos40°)=?1/cos80°(3/sin²40°-1/cos4
1/cos80°(3/sin²40°-1/cos40°)=?
1/cos80°(3/sin²40°-1/cos40°)=?
1/cos80°(3/sin²40°-1/cos40°)=?
1/cos80°(3/sin²40°-1/cos40°)=?
1/cos80°(3/sin²40°-1/cos²40°)=?
哪一题?