what the angle in radians between and

Question

what the angle in radians between <-5,9,32> and <5,-8,3>

anonymous · Answer

what is the identity of a dot product, do you know?

anonymous · Answer

Nope

anonymous · Answer

Are you in calculus right now?

anonymous · Answer

Yes calc 3

anonymous · Answer

What does does $$\huge U \cdot V$$ equal??  there is an identity.

anonymous · Answer

Try this cos theta = v*w/abs(v)*abs(w). So, you can write cos theta= <-5,9,32> x<5,-8,3>/sqrt(-5^2+92+32^2) * sqrt(5^2+(-8)^2+32).

anonymous · Answer

it's not the absolute value.  it's the magnitude, they are not the same.

anonymous · Answer

sorry

anonymous · Answer

I don´t know what symbol use here.

anonymous · Answer

it's alright, just wanted to make sure it was clear so it wasn't confused with doing the wrong thing, ya know?

anonymous · Answer

Yes, that´s for sure.

anonymous · Answer

$$\huge \vec U \cdot \vec V = ||\vec U|| * ||\vec V|| \cos(\theta)$$

anonymous · Answer

ah, don't just give answers.....

anonymous · Answer

Hey Jessicar make the calculations. Just this.

anonymous · Answer

But in the formulae above i Think cos theta must written above in the denominator. As we can seen above it seems that we have a multiplication of all entities.