作业帮2sin2x／1＋cos2x乘cos＾2x／cos2x化简等于?
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2sin2x／1＋cos2x乘cos＾2x／cos2x化简等于?
2sin2x／1＋cos2x乘cos＾2x／cos2x化简等于?
2sin2x／1＋cos2x乘cos＾2x／cos2x化简等于?
[2sin2x/(1+cos2x)]*[cos^2x/cos2x]
=[2*2cosx*sinx/(1+2cos^2x-1)]*[cos^2x/cos2x]
=[2sinx/cosx]*[cos^2x/cos2x]
=2sinx*cosx/cos2x
=sin2x/cos2x
=tan2x