cos(-π/3-π)=?
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cos(-π/3-π)=?
已知sin(3π+θ)=lg1/(10开3次方),求值cos(π+θ)/cosθ{cos(π-θ)-1} + cos(θ-π)/cos(π-θ)+cos(更正:已知sin(3π+θ)=lg1/(10开3次方),求值cos(π+θ)/cosθ{cos(π-θ)-1} + cos(θ-π)/cos(π-θ)+cos(θ-2π) 高一数学
已知sin(3π+θ)=lg1/(10开3次方0{cos(π+θ)/cosθ[cos(π-θ)-1]}+{ cos(θ-π)/cos(π-θ)+cos(θ已知sin(3π+θ)=lg1/(10开3次方)求{cos(π+θ)/cosθ[cos(π-θ)-1]}+{ cos(θ-2π)/cos(π-θ)+cos(θ-2π)}(最后结果
数学,详细步骤解释谢谢cos(π/2)+cos(π)+os(3π/2)+cos(2π)+.+cos(10π)=0
化简cos(π/9)cos(2π/9)cos(3π/9)cos(4π/9)=( ).请说明理由哦、
已知α,β∈(0.π),cosα+cosβ=3∕2+cos(α+β),则cos(α/2-β/2)= ;α+β=
cos(π/3+x)+cos(π/3-x)
化简cos(1-π)+cos(3π+1)=
cos(π-α)=-cosα的推导过程
怎知cos(-a-π)=-cos(-a)?
cos(-2/3)π=?
cos(3π-α)=?
cos(3π-a)=?
cos(-20π/3)=
cos^2 π/8+cos ^2 3π/8+ cos^2 5π/8+cos^2 7π/8=?
计算cos(a+5π/12)cos(a+π/6)+cos(π/12-a)cos(π/3-a)
利用诱导公式求三角函数值 cos 6/65π一,利用诱导公式:cos(2kπ+α)=cosα (k∈Z)和cos(π-α)=-cosα 得出cos65π/6=cos(65π/6-10π)=cos(5π/6)=cos(π-π/6)=-cosπ/6=-√3/2二,又或者cos65π/6=cos(11π-1π/6)=-cos(
为什么cos(-α-π) = cos(α+π)还有-cos(-π-α)等于多少?