cosπ/5*cos2π/5的值等于
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cosπ/5*cos2π/5的值等于
1/4
-(1/25)
(cosπ/5)(cos2π/5)的值等于
cosπ/5*cos2π/5的值等于
cosπ/5*cos2π/5的值等于 A1/4 B1/2 C2 D4
cosπ/5·cos2π/5等于多少?
cosπ/5 乘以cos2π/5等于多少
cosπ/5cos2π/5的值等于A.1/4; B.1/2; C2; D4(要演算过程)
cosπ/5cos2π/5的值等于 :麻烦过程竖着写 横着写看不懂~最好一步一步写清楚~
求COSπ/5*COS2π/5
cosπ/5×cos2π/5=
COSπ/5乘以COS2π/5
cosπ/5×cos2π/5
cosπ/5cos2π/5
cosπ/5cos2π/5=?
cosπ/5 - cos2π/5 怎样变成 cosπ/5 + cos2π/5rt
已知cosθ等于负5分之3,且θ属于(π,2分之3π),求cos2分之θ的值值
已知cosθ等于负5分之3,且θ属于(π,2分之3π),求cos2分之θ的值
计算cos∏/5乘以cos2∏/5的值.
化简cosπ/5cos2π/5RT.