# Additional Open Resources

This is another open precalculus / college algebra & trig book. It is a good source of additional practice problems, as well as more rigorous explanation of some topics.

A good additional reading for trig. Contains some nice applications to other disciplines.

This is another open textbook, used by the University of Washington. It is intended for a one-quarter problem solving refresher course before calculus. This book is a great source of interesting application and multistep problems.

An archive of old exams from UW's precalculus class. This is a great source of interesting and multistep problems.

Precalculus videos from Khan Academy.

Another great source of algebra and precalculus videos

An online graphing calculator that can find intersections, max/mins, and intercepts

A great tool when you need help solving tricky equations

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