cos(a)=wortel(3)/2
a=-30° of a=150°
a=30° of a=-30°
cot(a)= - wortel(3)
a=-30° of a=210°
a=150° of a=-150°
sin(a)=1/2
a=30° of a=150°
cos(a)= - wortel(3)/2
tan(a)= wortel(3)/3
sin(a)= - 1/2
a=30° of a=210°
