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w(1)=0
a²+4a+4=0
(a+2)²=0
a=-2
2.
ctgα=1/tgα
ctgα=0,5
sinα/cosα=tgα
sin²α+cos²α=1
sin=2cosα
4cos²α+cos²α=1
5 cos²α=1
cos²α=1/5
cosα=√5/5
sin=2√5/5