sin(a+β)cos(r-β)-cos(β+a)sin(β-r)跟tan5π/4+tan5π/12 / 1-tan5π/12要怎么算
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sin(a+β)cos(r-β)-cos(β+a)sin(β-r)跟tan5π/4+tan5π/12 / 1-tan5π/12要怎么算
sin(a+β)cos(r-β)-cos(β+a)sin(β-r)跟tan5π/4+tan5π/12 / 1-tan5π/12要怎么算
sin(a+β)cos(r-β)-cos(β+a)sin(β-r)跟tan5π/4+tan5π/12 / 1-tan5π/12要怎么算
sin(a+β)cos(r-β)-cos(β+a)sin(β-r)
=sin(a+β)cos(r-β)-cos(a+β)sin[-(r-β)]
=sin(a+β)cos(r-β)+cos(a+β)sin(r-β)
=sin[(a+β)+(r-β)]
=sin(a+r)
[(tan5π/4)+(tan5π/12)]/[1-(tan5π/12)]
=[(tan(π+π/4))+(tan5π/12)]/[1-(tan5π/12)]
=[(tan5π/12)+(tanπ/4)]/[1-(tan5π/12)]
=[(tan5π/12)+(tanπ/4)]/[1-(tanπ/4)(tan5π/12)]
=tan(5π/12+π/4)
=tan(2π/3)=-√3
sin(α+β)cos(r-β)-cos(β+a)sin(β-r) 化简
设α,β∈R,A(cosα,sinα),B(cosβ,sinβ),则|AB|max=
化简:sin(α+β)cos(r-β)-cos(β+α)sin(β-r).
化简:sin(α-β)sin(β-r)-cos(α-β)cos(r-β)
sin(α+β).cos(r-β)-cos(β+α).sin(β-r)
sin(a+β)cos(r-β)-cos(β+a)sin(β-r)跟tan5π/4+tan5π/12 / 1-tan5π/12要怎么算
证明cos(a+β)cos(a-β)=cos^2a-sin^2β
sin(a-b)sin(b-r)-cos(a-b)cos(r-b)
化简,sin(a+b)cos(r-b)-cos(b+a)sin(b-r)
化简 :sin(a+b)cos(r-b)-cos(b+a)sin(b-r) sin(a-b)sin(b-r)-cos(a-b)cos(r-b)sin(a+b)cos(r-b)-cos(b+a)sin(b-r) 和 sin(a-b)sin(b-r)-cos(a-b)cos(r-b)
已知a=(cosα,sinα),b=(cosβ,sinβ)(α,β∈R),若a=λb,则实数λ的值为
sin(α-β)sin(β-r)-cos(α-β)cos(r-β) 1.sin(α-β)sin(β-r)-cos(α-β)cos(r-β)2.( tan4分之5π+tan12分之5π)/(1-tan12分之5π)3.[ sin(α+β)-2sinαcosβ]/2sinαsinβ+cos(α+β)
存在α,β∈R,使cos(α+β)=cosα+sinβ,对吗
化简sin(a-β)cosβ+cos(a-β)sinβ得
sin(a+β)cos(a-β)=sinacosa+sinβcosβ马上解决啊
化简sin^2a+sin^β-sin^2a*sin^2β+cos^2a*cos^β
sin(α+β)-2cosαsinβ/2cosαcosβ-cos(α+β)
三角函数题:设α,β,γ∈R,则sinαcosβ+sinβcosγ+sinγcosα的最大值是——