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If b,c B are given, and if b lt c, show ...

If b,c B are given, and if `b lt c`, show that `(a_1 -a_2)^2 +(a_1 + a_2)^2 tan^2 B= 4b^2`, where `a_1,a_2` are the two values of the third side.

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The correct Answer is:
`= 4b^2`
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