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The area of figure bounded by the curves...

The area of figure bounded by the curves `y=a^x(a gt 1) and y=b^-x (b gt 1)` and the straight line `x = 1` is (1) `1/(loga) (a-1)+1/(logb) (1/b-1)` (2) `loga(a-1)+logb(1/b-1)` (3) `1/(loga)(a-1)+1/(log b)(b-1)` (4) `loga(a-1)+logb.(b-1)`

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