Question:`a/b = c/a = k` `(a^2 + b^2)/(a^2 - b^2)` কে k এর মাধ্যমে প্রকাশ করলে নিচের কোনটি হবে? 

A `k^2 + 1` 
B `k^2 - 1` 
C `(k^2 + 1)/(k^2 - 1)` 
D `(k^2 + 1)/k^2` 

+ Answer
C 

+ Explanation
`((bk)^2 + b^2)/((bk)^2 - b^2) = (b^2 (k^2 + 1))/(b^2 (k^2 - 1)) = (k^2 + 1)/(k^2 - 1)`

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Irin Moni

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