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In an obtuse angled triangle, the obtuse...

In an obtuse angled triangle, the obtuse angle is `(3pi)/4` and the other two angles are equal to two values of `theta` satisfying `atantheta + bsectheta =c`, where `|b|<=sqrt(a^2+c^2)`, then `a^2-c^2` is equal to

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2ac
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