(tan5°-cos5°/sin5°)*(cos20°-1)/cos°70
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(tan5°-cos5°/sin5°)*(cos20°-1)/cos°70(tan5°-cos5°/sin5°)*(cos20°-1)/cos°70(tan5°-cos5°/sin5°)*(cos20
(tan5°-cos5°/sin5°)*(cos20°-1)/cos°70
(tan5°-cos5°/sin5°)*(cos20°-1)/cos°70
(tan5°-cos5°/sin5°)*(cos20°-1)/cos°70
cos20=sin70 原式=(sin5/cos5-cos5/sin5)cos70/(1+sin70) =[(sin5)^2-(cos5)^2]/sin5/cos5*cos70/(1+sin70) =-2cos10/sin10*sin20
建议你买中学版计算机
(tan5°-cos5°/sin5°)*(cos20°-1)/cos°70
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