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
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
求值:sin4 π/8+sin4 3π/8+sin4 5π/8+sin4 7π/8 这里的‘4’都为四次方
tan(5π+a)=-2且cosa>0则sin(a-π)=sin(-π/3)+2sin4/3π+3sin2/3π=
已知α∈(π/2,π),且sinα=3/5,则sin^2α/2+(sin4αcos2α)/(1+cos4α)的值为多
若cos4分之πcosθ-sin4分之3πsinθ=0,θ的绝对值
sin(-π/3)+2sin4/3π+3sin2/3π等于( )A.1 B.0.5C.0 D.-1
sin(-兀/3)+2sin4兀/3+3sin2兀/3=?
求证:tan^2(α)-1/ tan^2(α)=-2sin4α/sin^3(2α)
已知sinα=√2/3,则sin4α-cos4α=
sin4/3兀等于?
已知sinα=3/5,且α是第二象限角,则sin4α/【4sin²(π/4+α)tan(π/4-α)】等于
sin4/3π*cos11/6π*tan3/4π=
sin4π/3tan(-5π/4)的值