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July 28, 2016
Posted by **Annie** on Sunday, December 6, 2009 at 2:31pm.

convert the equation r = 2tan(theta) into rectangular form.

I'm not really sure what either of these mean. I vaguely understand polar coordinates, but I'm not sure how to convert equations back and forth between polar and rectangular. Please help =(

- precalculus -
**Sharon Lin**, Sunday, April 12, 2015 at 11:55pmr = tan(θ)

√(x² + y²) = y/x

tan(θ) = y/x

r = √(x² + y²)

x² + y² = 4y²/x²

x^4 + x²y² = 4y²

x^4 + x²y² - 4y² = 0