r minus 3 ka whole square + 6 square
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(r-3) ^2+(6) ^2=r^2-6r+9+36
=r^2-6r+45
=r^2-6r+45
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(R-3)²+(6)²
R²-2×R×3+(3)²+36
R²-6R+9+36
R²-6R+45
R²-2×R×3+(3)²+36
R²-6R+9+36
R²-6R+45
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