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b = -3i +j + 5k
ΙaΙ = √ 1² + (-5)² + 3² = √ 1+25+9 = √35
ΙbΙ = √(-3)² + 1² + 5² = √ 9+1+25 = √35
cosθ = ab / ΙaΙ.ΙbΙ = (-3-5+15) / √35 . √35
cosθ = 7 / 35
cosθ = 1 / 5
θ = 78,46°