# Search results

1. ### Tough Integral

thats the thing i know how to integrate ln(x) where x is any function wih power 1. ln(x^3-1) let t = x^3-1 --> 3x^2dx=dt when i sub that in i dont know how to proceed =ln(t)dt/3x^2 --> maybe another substitution, ie let u=3x^2, du=6xdt, any help guys?
2. ### Tough Integral

Homework Statement Integral of: 2x^3/(x^3-1) with respect to x. The Attempt at a Solution you can divide them to get sum of integrals. =int(2,x) + 2*int(1/(x^-1),x) =2x + 2*int(1/(x^-1),x) Im having trouble proceeding with the last part, i just need help getting started.
3. ### Coplanar math problem

Homework Statement Find all values of t so that the three vectors a=(1,2,3) b=(4,5,6) and c=(7,8,t) are coplanar. Homework Equations (axb) \bullet c=0 The Attempt at a Solution (1, 2, 3) x (4, 5, 6) (-3,6,-3) (-3,6,-3)\bullet(7,8,t) 27=3t t=9 it says find ALL values of t. i keep getting 9...
4. ### Find and verify parametric equations for an ellipse

I think I understand most of what you are saying, however I am not trying to go from rectangular to polar, I just want to verify this in rectangular form.
5. ### Find and verify parametric equations for an ellipse

I'm sorry I do not understand. Please simplify the sentence. There is a question asking to find and verify parametric equations for an ellipse. How would we start and finish such a complex question? Thank you in advance.
6. ### Find and verify parametric equations for an ellipse

Homework Statement Find and verify parametric equations for an ellipse. Homework Equations x=acost y=bsint The Attempt at a Solution lets say the equation is x=3cost, y=3sint, domain: 0 to 2pi x2 y2 -- + -- = 1 a2 b2 point does verify when t=0 x=3, y=0 which =1...