- #1

Juntao

- 45

- 0

So that's the problem.

All I got so far is

r1(t)=t(i)+t^2(j)+t^3(k)

r2(t)=sint(i)+sin 2t(j)+t(k)

Now I'm stuck. I'm not sure where to go now.

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- Thread starter Juntao
- Start date

- #1

Juntao

- 45

- 0

So that's the problem.

All I got so far is

r1(t)=t(i)+t^2(j)+t^3(k)

r2(t)=sint(i)+sin 2t(j)+t(k)

Now I'm stuck. I'm not sure where to go now.

- #2

StephenPrivitera

- 363

- 0

Now how do you find the angle f between two vectors?

A*B=ABcosf

1=(1)sqrt(6)cosf

f=arccos(sqrt(6)/6)=66 degrees

- #3

HallsofIvy

Science Advisor

Homework Helper

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- #4

StephenPrivitera

- 363

- 0

I interpreted, "Don't go off on a tangent" to mean "Tangents aren't the way to solve the problem."

- #5

Juntao

- 45

- 0

Great. My answer matched yours.

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