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In the ambiguous case, if a, b and A are given and c1,c2 are the two values of the third sides, then (c1 - c2)2 + (c1 + c2)2.tan2A is equal 

(A)  4 

(B)  4a2 

(C)  4b2 

(D)  4C2

1 Answer

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Best answer

Correct option (B)  4a2 

Use cos A for both c1 and c2.

Now,

c1c2 = b2 - a2

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