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If (15a^(2)+4b^(2))/(15a^(2)-4b^(2))=(47...

If `(15a^(2)+4b^(2))/(15a^(2)-4b^(2))=(47)/(7)` then find the values of the following (i) `(a)/(b)` (ii) `(7a-3b)/(7a+3b)` (iii) `(b^(2)-2a^(2))/(b^(2)+2a^(2))`

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