求值:(sin75°-cos75°)/(sin75°+cos75°)
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求值:(sin75°-cos75°)/(sin75°+cos75°)
求值:(sin75°-cos75°)/(sin75°+cos75°)
求值:(sin75°-cos75°)/(sin75°+cos75°)
sin75=(√6+√2)/4,cos75=(√6-√2)/4
原式=[(√6+√2)/4-(√6-√2)/4]/[(√6+√2)/4+(√6-√2)/4]=√3/3
√3/3
求值:(sin75°-cos75°)/(sin75°+cos75°)
(cos75°+sin75°)(cos75°-sin75°)
(sin75°-cos75°)分之(sin75°+cos75°)我要具体步骤 在线等
cos75°-sin75°除以 cos75°+ sin75°
(sin55°+cos75°sin20°)/(cos55°-sin75°sin20°)求值
Sin75°/Cos75°+Cos75°/Sin15°=?
Sin75°/Cos75°+Cos75°/Sin15°=?
计算,sin75°*cos75°=
计算:(cos75°+sin75°)乘(cos75°-sin75°)=
化简:sin75°cos75°是sin75°乘cos75°
(cos15°-cos75°)(sin75°+sin15°)怎么化简?
(cos15°-cos75°)(sin75°+sin15°)=?
sin15°cos75°+cos15°sin75°
sin15°cos75°+cos165°sin75°
+-根号(sin75°cos75°)=+-根号(sin150°/2)这步是为什么啊
根2/2(cos75°+sin75°)的值为
求值:sin105°·cos75°=
tan15°、tan75°sin15°、sin75°、cos15°cos75°具体数值