

Tính:
[tex]\huge \dpi{50} cot67^{\circ}+sin^{2}18^{\circ}-tan23^{\circ}+cos^{2}72^{\circ}-\frac{2tan33^{\circ}}{cot57^{\circ}}[/tex]
[tex]\huge \dpi{50} cot67^{\circ}+sin^{2}18^{\circ}-tan23^{\circ}+cos^{2}72^{\circ}-\frac{2tan33^{\circ}}{cot57^{\circ}}[/tex]