Recent content by EconStudent

  1. E

    Product of a Derivative and its Inverse

    That's so clever, thank you. Substituting for x and squaring the top and bottom, we get sin2/1-cos2 which is just sin2/sin2.
  2. E

    Product of a Derivative and its Inverse

    Homework Statement For the functions: x = r*cos(θ) y = r*sin(θ) Calculate dθ/dX * dX/dθ (considering θ as a function of x, y) and simplify. The Attempt at a Solution I believe this should always be 1, by definition (as the product of a derivative and its inverse). However, I...
  3. E

    Solve 3D Vector Problem: Plane Parallel to ABC Containing D

    I understand my misstatement; my process is correct but my conception was incorrect. It is difficult for me to wrap my head around these multidimensional problems. Thanks for the help.
  4. E

    Solve 3D Vector Problem: Plane Parallel to ABC Containing D

    Homework Statement The four points A = (-1, -1, -1), B = (1, 1, -1), C = (1, -1, 1) and D = (-1, 1, 1) are the vertices of a triangular pyramid. Use vectors to calculate: d) an equation (in vector form) of the plane parallel to the face ABC and containing the point D The Attempt at a...