作业帮sinπ/12cos5π/12等于
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sinπ/12cos5π/12等于
sinπ/12cos5π/12等于
sinπ/12cos5π/12等于
积化和差公式：
sinAcosB=[sin(A+B)+sin(A-B)]/2
sinπ/12cos5π/12=[sinπ/2+sin(-π/3)]/2=(1-√3/2）/2=1/2-√3/4
sinπ/12cos5π/12
=sinπ/12sin(π/2-5π/12)
=(sinπ/12)^2
=[1-cos(2*π/12)]/2
=(1-cosπ/6)/2
=(2-√3)/4
sinπ/12cos5π/12等于
为什么cos5π/12等于sinπ/12
求cos5π/12sinπ/12
cos5π/12=sinπ/12 怎么算的?
cos5π等于=
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
(sin5π/12-sinπ/12)(cos5π/12+cosπ/12)=?
cos5/12πcosπ/12+cosπ/12sinπ/6=?
sinπ/8*cos5π/8
sin派/12*cos5派/12
(sina5π/12+cos5π/12)(sin5π/12-cos5π/12)
sin5π和cos5π等于多少
cos5π/3为什么等于1/2?
cos5╱12派等于多少?
sin(-4/3π）+cos5/6π=
把下列三角函数值从小到大排列起来：sin4/5π -cos5/4π sin32/5π cos5/12π求函数y=sin(π/6-x/3),x∈[-2π,4π]的单调递增空间.
cos5分之π×cos5分之2π
cosπ/12*cos5π/12结果是1/4