The simplification of `(0.2xx0.2 + 0.02xx0.02 - 0.4xx 0.02)/(0.36)`gives
0.2 x 0.2 + 0.02 x 0.02 - 0.4 x 0.02 = 0.2 x 0.2 + 0.02 x 0.02 - 2 x 0.2 x 0.02
= (`a^2` + `b^2` - 2ab) = `(a - b)^2` = ` (0.2 - 0.02)^2` = `(0.18)^2`
Given expression = `(0.18xx0.18)/(0.36)` = 0.09.
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