Question 1159471
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Polar form

    x = r*cos(a)

    y = r*sin(a)


Substitute it into the given equation

    {{{r^2*cos^2(a)}}} + {{{(r*sin(a)+5)^2}}} = 25.


It is just the desired polar form equation.


You may transform it further by any equivalent way.
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Solved.