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cos330=cos(330-180)=cos150=cos(180-150)=cos30
tg150=tg(180-150)=tg30
ctg225=ctg(225-180)=ctg45
sin30 + cos30 \ tg30 - ctg45= x
1/2 +[3/2 / [3/3 -1=x
1/2+ [3/2 * 3/[3 -1=x
1/2+ 3[3 / 2[3 -1=x
1/2+3/2-1=x
4/2-1=x
2-1=x
x=1
[3-pierwiastek z 3