化简sin(派/4-x)sin(派/4+x)
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化简sin(派/4-x)sin(派/4+x)
化简sin(派/4-x)sin(派/4+x)
化简sin(派/4-x)sin(派/4+x)
sin(派/4-x)sin(派/4+x)
=(sinπ/4cosx-cosπ/4sinx)*(sinπ/4cosx+cosπ/4sinx)
=(sinπ/4cosx)^2-(cosπ/4sinx)^2
=(cosx)^2/2-(sinx)^2/2
=(cos2x)/2
化简sin(派/4-x)sin(派/4+x)
化简2sin(派/2-x)×sin(派/4+x),
化简sin(派-x )
化简4sin派/8*cos派/8*(cos^2派/8-sin^2派/8)
化简:sin(x-2派)cos(x+派)tan(x-99派)/cos(派-x)sin(3派-x)sin(-x-派)
对任意实数x,化简sinx+sin(x+2/3派)+sin(x+4/3派)=?
化简sin(13派/6)+cos(7派/3)-tan(49派/4)
已知 Sin(X+ 派/6)=1/4求 Sin(5/6派 - X)+Sin^2 (派/3 -X)
sin(a-派/4) +cos(派/4+a) 化简
化简cos(派/4+a)+sin(派/4+a)
sin(派-a)=4/5.且派/5
化简sin(派-x)+sin(派+x)-cos(-x)+cos(2派-x)-tan(派+x)cot(派-x)
在下列各区间中.是sin(x+ 派/4 )的单调增区间的是[ 派/2,派][0,派/4][-派,0][派/4,派/2]
2tan(派/4-X)SIN^2(派/4+X)化简
已知sinx=4/5,x属于(派/2.派)求sin(2x+派/4)的值
y=sin(x+7派/4)+cos(x-3派/4)
sin(x-派)等于sin派还是负的sin派了
已知sinx=-根号5/5,x属于(派,3/2派),则sin(2x-派/4)=