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sinα=0,8
sin²α+cos²α=1
cos²α=1-sin²α
cos²α=1-0,64
cos²α=0,36
cosα=0,6
cos²α*(sin²α/cos²α +1)=sin²α+cos²α=1
L=P
cos^2(alfa)+0,64=1
cos^2(alfa)=0,36
cos(alfa)=0,6