tan - tangenta si cot - cotangenta (Latexu e in engleza si folosesc deja asa)
[tex]\displaystyle Deoarece:~\cos30^\circ=\frac {\sqrt 3}{2}~si~\cos45^\circ=\frac{\sqrt 2}2~si~\tan x \times \cot x=1:\\ \\ 8\times \cos30^\circ-3\sqrt 2\cos45^\circ-\sqrt 3\times \tan60^\circ\times \cot 60^\circ=\\ \\ =8\times \frac{\sqrt 3}2-3\times \sqrt2\times \frac {\sqrt 2}2-\sqrt 3\times 1=\\ \\ =4\times \sqrt 3-3-\sqrt 3=\\ \\ =3\times \sqrt 3-3\\ [/tex]
