[sin4α/(1+cos4α)]×[cos2α/(1+cos2α)]×[cosα/(1+cosα)]=?

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[sin4α/(1+cos4α)]×[cos2α/(1+cos2α)]×[cosα/(1+cosα)]=?[sin4α/(1+cos4α)]×[cos2α/(1+cos2α)]×[cosα/(1+co

[sin4α/(1+cos4α)]×[cos2α/(1+cos2α)]×[cosα/(1+cosα)]=?
[sin4α/(1+cos4α)]×[cos2α/(1+cos2α)]×[cosα/(1+cosα)]=?

[sin4α/(1+cos4α)]×[cos2α/(1+cos2α)]×[cosα/(1+cosα)]=?
[sin4α/(1+cos4α)]×[cos2α/(1+cos2α)]×[cosα/(1+cosα)]=[2*2*[2sin(α/2)cos(α/2)]cosα/(2cos2α) ] × cos2α/[2(cosα)^2] × cosα/[2(cosα/2)^2]=tan(α/2)