sin(-π/3)+2sin4/3π+3sin2/3π等于（ ）A.1 B.0.5C.0 D.-1
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sin(-π/3)+2sin4/3π+3sin2/3π等于（）A.1B.0.5C.0D.-1sin(-π/3)+2sin4/3π+3sin2/3π等于（）A.1B.0.5C.0D.-1sin(-π/3
sin(-π/3)+2sin4/3π+3sin2/3π等于（ ）A.1 B.0.5C.0 D.-1
sin(-π/3)+2sin4/3π+3sin2/3π等于（ ）
A.1 B.0.5
C.0 D.-1
sin(-π/3)+2sin4/3π+3sin2/3π等于（ ）A.1 B.0.5C.0 D.-1
sin(-π/3)+2sin4/3π+3sin2/3π
=sin(-60)+2sin(240)+3sin(120)-----转化成角度(也可以直接计算到下一步)
=-(3^1/2)/2+2(-(3^1/2)/2)+3(3^1/2)/2
=0
=-根号2+2*-根号2+3根号2=0
sin(-π/3)+2sin4/3π+3sin2/3π
=-sin(π/3)-2sin(π/3)+3sin(π/3)
=0
选c
c
sin(-π/3)+2sin4π/3+3sin2π/3
sin4/3π等于多少?
arcsin(sin4π/3)=
化简:(sinα-cosα)^2+sin4α/2cos2α 化简:sin^2x+sin^2(x+2π/3)+sin^2(x-2π/3)
化简 2sin²2α+√3sin4α-
sin4/3π=详细过程谢谢
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sin(-π/3)+2sin4/3π+3sin2/3π等于（ ）A.1 B.0.5C.0 D.-1
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