(ctg 30stopni -tg 45stopni )² - 2(tg 60stopni + ctg45 stopni)²=
(√3-1)²-2(√3+1)² =3-2√3+1-2(3+2√3+1)=3-2√3+1-2(2√3+4)=4-2√3-4√3-8=-6√3-4
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(ctg 30stopni -tg 45stopni )² - 2(tg 60stopni + ctg45 stopni)²=
(√3-1)²-2(√3+1)² =3-2√3+1-2(3+2√3+1)=3-2√3+1-2(2√3+4)=4-2√3-4√3-8=-6√3-4