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 Apr11 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 Mar25 revised proving Pythagoras Theorem in the third dimension using orthogonal projection from a parallelogram Added Latex markup Feb22 revised Confused with the notation/halfway done and need a little help put in  Jan31 revised How to check if a matrix is positive definite added 1 character in body May14 revised Gaining Linear Algebra Intuition — Subspaces Thought this tag may help clarify OP intent. Feb25 revised How To Generate Random Points on the Positive Side of a Plane in 3-D added 594 characters in body Feb21 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 Feb20 revised Double integral of a region. second edit Feb20 revised Double integral of a region. Fixed copy paste error Feb20 revised Double integral of a region. Expanded answer. Feb13 revised Proving this inequality clarified that the answer is a counter example. Feb6 revised Indefinite integral of secant cubed Added LaTeX for equation. Jan25 revised Questions about Probability Expanded answer based on comment. Dec10 revised Find $d$ of a plane equation added 167 characters in body Dec10 revised Find $d$ of a plane equation added 167 characters in body Aug29 revised The convex function proof. Formatted formula in LaTeX Jun25 revised What is the column space in a $5\times 5$ invertible matrix? added 2043 characters in body May23 revised Can you find the resultant force between these two vectors? added 7 characters in body; edited body Apr22 revised Is the sum of two normal operators normal? fixed latex Apr2 revised Why can't you flatten a sphere? fixed typos