Some useful relationships
3 / 2 ; tan 30 = 1 / 3 ; sin 60 =
sin 30 = 1/2 ; cos 30 =
sin 45 = cos 45 = 1 /
3 / 2 ; cos 60 = 1/2; tan 60 =
3
2 ; tan 45 = 1; sin + cos = 1
2
2
8
c = 3 10 m/s ; e = 1.602 10-19 C; o = 8.85 10-12 C2/N.m2; 1/4o = 9.0 109 N.m2/C