搜狗做题网派派-7^2精确到零点零一是多少
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f(x)=√3sin²x+sinxcosx=√3[(1-cos2x)/2]+1/2sin2x=1/2sin2x-√3/2cos2x+√3/2=sin(2x-π/3)+√3/2∵x∈[π/2,
（1）cos(π/5)+cos(2π/5)+cos(3π/5)+cos(4π/5) =cos(π/5)+cos(2π/5)-cos(2π/5)-cos(π/5) =0（2）tan10°+tan17
圆周率小数点后2000位1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348
当然是错的.后面的：2k派+3派/2>2k派应该是：]=[2k派+3派/2,2（k＋1）派]
π*r^2*150/360=240πcm^2解得：r=24cm扇形弧长=2π*r*150/360=2*3.14*24*150/360=62.8cm
2a=(a+b)+(a-b)π/2
(sinx+cosx=)^2=1+2sinxcosx=1/252sinxcosx=-24/25(sinx-cosx)^2=1-2sinxcosx=1+2*24/25=49/25-π/2
3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706
每10股派现金分红2元,每一股派2毛钱.楼主有多少股票,乘以0.2元就知道得到多少分红了.
派/2
0.8
=cos(-30)+cos150+cos(330)+cos510.+cos(2010π-30)=cos30-cos(30)+cos30-cos30.+cos30=cos30+0+0+0...+0=co
直接反用2倍角公式就可以了：2sinαcosα=sin2αcos2α=cos^2(α/2)-sin^2(α/2)原式=2sinπ/4cosπ/4=sinπ/2=1
f(a)=[-cosa(-sina)(-tana)]/[-tana(-sina)]=-cosa;tan（a-3派/2)=-cota=-2,所以cota=2,即tana=1/2>0,cosa=±1/√(
sin(x+π/3)sin(x+11π/6)=1/2则有：sin(x+π/3)sin[(x-π/6)+2π]=1/2sin(x+π/3)sin(x-π/6)=1/2-----(1)由于：sin(x+π
Pi表示派.cos(2pi/7)+cos(4pi/7)+cos(6pi/7)=1/[2sin(2pi/7)]*[2sin(2pi/7)cos(2pi/7)+2sin(2pi/7)cos(4pi/7)+
快件已经到达所在地区的快递公司,快递员正在送件!
sin(A-派)=-sinAcos(A-派)=-cosAcotA=cosA/sinAtanA=sinA/cosA所以[sin(A-派)cot(A-2派)]/[cos(A-派)tan(A-2派)]=-s
sin0=0/1=0sin派=0/(-1)=0sin派/2=1/1=1sin3派/2=-1/1=-1sin2派=0/1=0cos0=1/1=1cos派=-1/1=-1.