Question 304851
{{{x^2+y^2=r^2}}} and {{{y=r*sin(theta)}}}


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{{{r=sin(theta)}}}



{{{r*r=r*sin(theta)}}}



{{{r^2=r*sin(theta)}}}



{{{x^2+y^2=r*sin(theta)}}}



{{{x^2+y^2=y}}}


Answer: A