You can use calculus to find the slope of any function at a given point. (Image by MIT OpenCourseWare.)
Single Variable Calculus
Multivariable Calculus
Lagrange multipliers with two variables Mathlet from the d'Arbeloff Interactive Math Project. (Image courtesy of Jean-Michel Claus.)
Linear Algebra
These windows in Philadelphia represent a beautiful block matrix. (Courtesy Gail Corbett. Used with permission.)
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Differential Equations
