Cari nilai R (complex solution)
R=\sqrt{2r^{2}}+r
R=-\sqrt{2r^{2}}+r
Cari nilai R
R=\left(\sqrt{2}+1\right)r
R=\left(1-\sqrt{2}\right)r
Cari nilai r
r=\left(\sqrt{2}-1\right)R
r=-\left(\sqrt{2}+1\right)R
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