tolong bantuannya gan

jawab

LK.KM = -2(-4) +1(3) -2(-1) = 8+3+2 = 13

|LK| = √(-2)² +(1)² +(-2)² = √9 = 3
|LM| = √(16+9+1) = √26
|LK.|LM| = 3√26


cos α =  LK.KM / |LK|.|LM|
cos α = 13/ 3√26
cos α = (√26)/(6) = (x)/(r)
y = √(r² - x²)
y = √(6² - (√26)²
y = √(36-26) = √10

tan α = y/x =  √10/√26
tan α =  1/13 √65