cos九分之派乘以cos九分之二派乘以cos九分之三派乘以cos九分之四派.
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/06/28 09:39:10
cos九分之派乘以cos九分之二派乘以cos九分之三派乘以cos九分之四派.
cos七分之π乘以cos七分之二π乘以cos七分之三π
cos七分之π乘以cos七分之二π乘以cos七分之三π
![cos九分之派乘以cos九分之二派乘以cos九分之三派乘以cos九分之四派.](/uploads/image/z/3632908-4-8.jpg?t=cos%E4%B9%9D%E5%88%86%E4%B9%8B%E6%B4%BE%E4%B9%98%E4%BB%A5cos%E4%B9%9D%E5%88%86%E4%B9%8B%E4%BA%8C%E6%B4%BE%E4%B9%98%E4%BB%A5cos%E4%B9%9D%E5%88%86%E4%B9%8B%E4%B8%89%E6%B4%BE%E4%B9%98%E4%BB%A5cos%E4%B9%9D%E5%88%86%E4%B9%8B%E5%9B%9B%E6%B4%BE.)
是求值吗? 若是这样,则方法如下:
原式=cos(2π/14)cos(4π/14)cos(6π/14)
=2sin(2π/14)cos(2π/14)cos(4π/14)cos(6π/14)/[2sin(2π/14)]
=sin(4π/14)cos(4π/14)cos(6π/14)/[2sin(π/7)]
=2sin(4π/14)cos(4π/14)cos(6π/14)/[4sin(π/7)]
=sin(8π/14)cos(6π/14)/[4sin(π/7)]
=sin(π/2+π/14)cos(π/2-π/14)/[4sin(π/7)]
=2cos(π/14)sin(π/14)/[8sin(π/7)]
=sin(π/7)/[8sin(π/7)]
=1/8
注:若你的意图不是我所猜测的那样,则请你补充说明.
原式=cos(2π/14)cos(4π/14)cos(6π/14)
=2sin(2π/14)cos(2π/14)cos(4π/14)cos(6π/14)/[2sin(2π/14)]
=sin(4π/14)cos(4π/14)cos(6π/14)/[2sin(π/7)]
=2sin(4π/14)cos(4π/14)cos(6π/14)/[4sin(π/7)]
=sin(8π/14)cos(6π/14)/[4sin(π/7)]
=sin(π/2+π/14)cos(π/2-π/14)/[4sin(π/7)]
=2cos(π/14)sin(π/14)/[8sin(π/7)]
=sin(π/7)/[8sin(π/7)]
=1/8
注:若你的意图不是我所猜测的那样,则请你补充说明.
cos九分之派乘以cos九分之二派乘以cos九分之三派乘以cos九分之四派.
cos三分之派-tan四分之派 +四分之三tan二次方 六分之派-sin 六分之派+cos二次方 六分之派
cos四分之派加sin六分之派
sin乘以二分之派加cos二分之派加sin三分之派减cos六分之派加tan零 等于?
cos(-3分之29派)
cos三分之拍-tan四分之拍+四分之三tan平方六分之派-sin六分之派+cos平方六分之派
cos四分之派为什么等于二分之根号二
sin 12分之派cos 12分之派=多少
cos(3分之25派)+sin(-6分之23派)
七分之四乘以九分之八加七分之二乘以九分之二 简便计算
cos负4分之派是多少
负cos.6分之派等于多少