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ctg x=1/tgx
ctgx*tgx=1/tgx * tgx { się skraca } = 1
tgx - ctg x=(tgx-1)(ctgx+1)
strona prawa: P=(tgx-1)(ctgx+1)=tgxctgx+tgx-ctgx-1=1+ tgx -ctgx-1= tgx-ctgx=L
L=P