tożsamość hmm: Wykaż tożsamość

sin(4α)*cos(2α)*cosα		α
	=tg
[1+cos(4α)][1+cos(2α)][1+cos(α)]		2

cosinus: 1+cos(4α)=2cos²(2α) , 1+cos(2α)=2cos²α , 1+cosα= 1cos²(α/2) i sin(4α)=2sin(2α)cos(2α) , sin(2α)=2sinαcosα, sinα=2sin(α/2)cos(α/2)

	2sin(2α)cos(2α)* cos(2α)*cosα
L=		=
	2cos2(2α)*2cos2α*2cos2(α/2)

= ............................. = tg(α/2) =P i podaj założenia