Calculus for Beginners and Artists is an online textbook that provides an overview of Calculus in clear, easy to understand language designed for the non-mathematician. Thank you MIT OpenCourseWare for awesome, free resources and classes!!!
Where the hell was this when I was learning limits?
Trig Reference sheet with ALL those identities, formulas, also includes Taylor Expansions, Unit Circle and tables of values
Nine simple math tricks you’ll wish you had always known - Why didn’t they teach us these in school?