Hello, guidol92!
You need a trig identity like: .
Multiply byWrite in rectangular coordinates: .
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Hello. I don't have the slightest idea of how to change this equation:
r = 3cos(2q) (q being an angle, call it theta, or whatever) to coordinate form.
i know that x=r cosq and y=r sinq but how i can use this to convert to the coordinate form?
thank you. if you can please show me a step by step to undersand it well.