Help with calculus

Question

Find the approximate angle between the vectors v=(2,-3) and w=(3,-5)

Answer 1

cos θ = (u · v) / (||u|| ||v||)

u · v ·= (2)(3) + (-3)(-5)

u · v = 21

||u|| = √13

||v|| = √34

Can you know calculate cos θ and answer?