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# polar co-ordinates help watch

1. I was given the equation x^2+y^2=a(x-y) and asked to convert to polar co-ordinates, after achieving the equation r=a(cos(theta) -sin(theta)) it asks me to find an equation where this is rotated by pi/4 anticlockwise. how do i go about this?
2. A curve is rotated anti-clockwise by a radians.
3. (Original post by drandy76)
I was given the equation x^2+y^2=a(x-y) and asked to convert to polar co-ordinates, after achieving the equation r=a(cos(theta) -sin(theta)) it asks me to find an equation where this is rotated by pi/4 anticlockwise. how do i go about this?
replace theta by (theta - pi/4)
4. Got it now thanks, realised i needed to put it into the addition angle formula afterwards

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Updated: February 18, 2016
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