প্রমাণ কর যে, $\mathrm{D}log\frac{\mathrm{AC}}{{\mathrm{B}}^2}-\mathrm{A}log\frac{{\mathrm{C}}^2}{{\mathrm{A}}^2\mathrm{B}}+\mathrm{B}log\frac{{\mathrm{B}}^4}{{\mathrm{A}}^4\mathrm{C}}=-log2$