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
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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cosπ/5乘以cos2π/5的值是多少?请
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
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
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
添项哦~原式先乘以2sinπ/5,然后用倍角公式化简,之后除以2sinπ/5~然后复杂的东西就木有啦~最后等于四分之一也就是0.25哦~
cosπ/5×cos2π/5 =2cosπ/5 sinπ/5 cos2π/5 / (2sinπ/5) =sin2π/5 cos2π/5 / (2sinπ/5) =1/2sin4π/5 / (2sinπ/5) =1/4
COSπ/5乘以COS2π/5
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
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