*The author proves visually that if \(a\) and \(b\) are the legs and h the altitude to the hypotenuse \(c\) of a right triangle, then \((1/a)^2 + (1/b)^2 = (1/h)^2\).*

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*Cramer's Rule gives an explicit formulation for the unique solution to a system of \(n\) equations in \(n\) unknowns when the coefficient matrix of the system is invertible. The...*

*The authors discuss the evaluation of certain improper integrals by first transforming them.*

*The Golden Mean is found in electric circuit theory.*

*The author provides a short proof of Cramer’s rule that avoids using the adjoint of a matrix.*