计算:(cos75°+sin75°)乘(cos75°-sin75°)=
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计算:(cos75°+sin75°)乘(cos75°-sin75°)=
计算:(cos75°+sin75°)乘(cos75°-sin75°)=
计算:(cos75°+sin75°)乘(cos75°-sin75°)=
=cos²75°-sin²75°
=cos(2×75°)
=cos150°
=-cos30°
=-√3/2
计算:(cos75°+sin75°)乘(cos75°-sin75°)=
计算,sin75°*cos75°=
化简:sin75°cos75°是sin75°乘cos75°
cos75°-sin75°除以 cos75°+ sin75°
(cos75°+sin75°)(cos75°-sin75°)
求值:(sin75°-cos75°)/(sin75°+cos75°)
Sin75°/Cos75°+Cos75°/Sin15°=?
Sin75°/Cos75°+Cos75°/Sin15°=?
(sin75°-cos75°)分之(sin75°+cos75°)我要具体步骤 在线等
(cos15°-cos75°)(sin75°+sin15°)=?
sin15°cos75°+cos15°sin75°
sin15°cos75°+cos165°sin75°
根2/2(cos75°+sin75°)的值为
(sin75°+cos75°)乘2分之根号下2只学过6个诱导神马两角和等没学过
tan15°、tan75°sin15°、sin75°、cos15°cos75°具体数值
(sin55°+cos75°sin20°)/(cos55°-sin75°sin20°)求值
化简:cos83°+sin75°sin8°/cos7°-cos75°cos82°
化简 cos15°cos45°-cos75°sin45° cos15°能否化成sin75°?