cosπ/5 乘以cos2π/5等于多少
cosπ/5 乘以cos2π/5等于多少
COSπ/5乘以COS2π/5
cosπ/5·cos2π/5等于多少?
(cosπ/5)(cos2π/5)的值等于
求COSπ/5*COS2π/5
计算cos∏/5乘以cos2∏/5的值.
cosπ/5乘以cos2π/5的值是多少?请给出具体解题过程,谢谢拜托各位大神
cos^2(2/π-a)+cos2^2(6/π+a)等于多少
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~
2分之1乘以5π乘以6等于多少
12分之5乘以π,再乘以3.24等于多少
cosπ/5*cos2π/5 =(2sinπ/5*cosπ/5*cos2π/5)/(2sinπ/5) =(sin2π/5