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A discussion of changing coordinate systems for complex numbers.
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Ask Dr. Math
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A helpful scientific calculator that runs in your web browser window.
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Holt Online Learning
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A discussion with examples to try.
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Ask Dr. Math
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The perfect study site for high school, college students and adult learners. Get help to do your homework, refresh your memory, prepare for a test, ....
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SOS math
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Step-by-step solutions to odd-numbered problems from dozens of precalculus textbooks.
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Hotmath
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Step-by-step solutions to odd-numbered problems from dozens of trigonometry textbooks.
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Hotmath
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How to solve equations in polar form.
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SOS Math
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