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 Feb 27 revised Coordinate transformations and interpreting what the Jacobian determinant describes added 731 characters in body Apr 11 revised Can some one help me parametrize $\frac{x^4}{a^4}+\frac{y^4}{b^4}+\frac{z^4}{c^4}=1$ deleted 8 characters in body Mar 25 revised proving Pythagoras Theorem in the third dimension using orthogonal projection from a parallelogram Added Latex markup Feb 22 revised Confused with the notation/halfway done and need a little help put in  Jan 31 revised How to check if a matrix is positive definite added 1 character in body May 14 revised Gaining Linear Algebra Intuition — Subspaces Thought this tag may help clarify OP intent. Feb 25 revised How To Generate Random Points on the Positive Side of a Plane in 3-D added 594 characters in body Feb 21 revised Find the ratio of the area inside the square but outside the circle to the area of the square in the figure. deleted 18 characters in body Feb 20 revised Double integral of a region. second edit Feb 20 revised Double integral of a region. Fixed copy paste error Feb 20 revised Double integral of a region. Expanded answer. Feb 13 revised Proving this inequality clarified that the answer is a counter example. Feb 6 revised Indefinite integral of secant cubed Added LaTeX for equation. Jan 25 revised Questions about Probability Expanded answer based on comment. Dec 10 revised Find $d$ of a plane equation added 167 characters in body Dec 10 revised Find $d$ of a plane equation added 167 characters in body Jun 25 revised What is the column space in a $5\times 5$ invertible matrix? added 2043 characters in body May 23 revised Can you find the resultant force between these two vectors? added 7 characters in body; edited body Apr 22 revised Is the sum of two normal operators normal? fixed latex Apr 2 revised Why can't you flatten a sphere? fixed typos