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I'am new here and happy to find this great forum!

Here's my first question: there's an explicit function as follows:

y=2.sin(x)-1

Thetransformationto polar form (r=3cos([itex]\theta[/itex]))

- x=r.cos([itex]\theta[/itex])

- y=r.sin([itex]\theta[/itex])

So I get: r.sin([itex]\theta[/itex])=2.sin(r.cos([itex]\theta[/itex]))-1

Now you see the problem: how can Iisolater in this equation ?

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# Transform explicit function to polar form

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