sin(2π-α)tan(α+π)cos(α-π)/cos(α+π)tan(3π-α)化简 快
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sin(2π-α)tan(α+π)cos(α-π)/cos(α+π)tan(3π-α)化简快sin(2π-α)tan(α+π)cos(α-π)/cos(α+π)tan(3π-α)化简快sin(2π-α
sin(2π-α)tan(α+π)cos(α-π)/cos(α+π)tan(3π-α)化简 快
sin(2π-α)tan(α+π)cos(α-π)/cos(α+π)tan(3π-α)
化简 快
sin(2π-α)tan(α+π)cos(α-π)/cos(α+π)tan(3π-α)化简 快
sin(2π-α)tan(α+π)cos(α-π)/cos(α+π)tan(3π-α)
=(-sinα)tanα(-cosα)/(-cosα)(-tanα)
=sinα
若α∈(-π/2+2kπ,2kπ)(k∈Z),则sinα,cosα,tanα的大小关系是A.tanα>sinα>cosαB.tanα>cosα>sinαC.tanα<sinα<cosαD.tanα<cosα<sinα
求证:(1-sinα+cosα)/(1+sinα+cosα)=tan(π/4-α/2)
求证:1-2sinαcosα/cos²α-sin²α=tan(π/4-α)
已知tan(3π+α)=2,求:1、(sinα+cosα)²;2、sinα-cosα/2sinα+cosα
已知tan(π-α)=2,求sin²α-2sinαcosα-cos²α/4cos²α-3sin²α+1
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[sin(2π+α)·tan(-α)·cos(-α)]÷[sin(-α)·cos(2π+α)·tan(2π+α)化简
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1)tan(x/2+π/4)+tan(x/2-π/4)=2tanx(2)(1-2sinαcosα/cos²α-sin²α)=(1-tanα)/(1+tanα)
①sin(α+180°)cos(-α)sin(-α-180°)和②sin³(-α)cos(2π+α)tan(-α-π)化简
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化简下列各式 1)cos(α-π)/sin(π-α)tan(α-π) 2)sin(180º+α)cos(-α)tan(π-化简下列各式 1)cos(α-π)/sin(π-α)tan(α-π) 2)sin(180º+α)cos(-α)tan(π-α)
2sin²α-sinαcosα/sinαcosα+cos²α (tan=2)
(2cos^2-1)/2tan(π/4-α)sin^2(π/4+α)