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Until an "equals" sign shows up somewhere in the expression, there's nothing to prove.
It also equals 13 12.
The question contains an expression but not an equation. An expression cannot be solved.
No
x2+y2=2y into polar coordinates When converting Cartesian coordinates to polar coordinates, three standard converstion factors must be memorized: r2=x2+y2 r*cos(theta)=x r*sin(theta)=y From these conversions, you can easily get the above Cartesian equation into polar coordinates: r2=2rsin(theta), which reduces down (by dividing out 1 r on both sides) to: r=2sin(theta)