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.1 B.0.5C.0 D.-1
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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