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The area of the triangle formed by the l...

The area of the triangle formed by the lines `y=a x ,x+y-a=0` and the y-axis is (a) `1/(2|1+a|)` (b) `1/(|1+a|)` (c) `1/2|a/(1+a)|` (d) `(a^2)/(2|1+a|)`

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