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|a| = √(2 ² +(-3)² +(5)² = √38
|b| = √29
,
2).
a.b = 2(-3) + (-3)(-2) + 5(4) = -6+6+20 = 20
.
4) cos x = a.b / |a||b| = 20/ √1.102 = 0,6 (kalkulator)
cos x = 0,6
sin x = 0,8
x = cos^-1 (0,6) = 53°
.
3) a x b |a|b| sin x = (√1.102) 0,8 = 26,56