Do not worry about your problems with mathematics, I assure you mine are far greater  ~ Albert Einstein

 

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Looking for a better PC calculator?  Microsoft provides PowerToy Calc, which is a more powerful calculator than what comes with Windows.  You can graph and evaluate functions as well as perform many different types of conversions.  Download this free calculator from the Microsoft PowerToys for Windows XP site.

Having problems with algebra?  Though you believe you're doing the physics problem correctly but can't get the answer in the back of the book, check your algebra here: Wolfram|Alpha.com.  This is basically Mathematica™ online.  Wolfram|Alpha.com can graph, expand, factor or simplify virtually any expression, cancel common factors within fractions, split fractions up into smaller ('partial') fractions and join two or more fractions together into a single fraction.  It can do much more!  Explore.

This site has a nice graphing calculator along with tools to help you with general algebra: http://www.algebrahelp.com/

Purplemath is a comprehensive site on algebra lessons demonstrating dependable techniques and pointing out common mistakes. The lessons are cross-referenced to help you find related material http://www.purplemath.com/modules/index.htm

A very compact and simple tutorial on basic trigonometry from the University of Guelph: http://www.physics.uoguelph.ca/tutorials/trig/trigonom.html

Just about everything you ever wanted to know about mathematics can be found at http://www.numericana.com