Maths-

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# In

- α
^{2}-b^{2} - α
^{2}+b^{2} - b
^{2}-c^{2} - b
^{2}+c^{2}

^{2}-b^{2}^{2}+b^{2}^{2}-c^{2}^{2}+c^{2}Hint:

### The angles of the triangle ABC are denoted by A, B, C and the corresponding opposite sides by a, b, c.

## The correct answer is: α^{2}-b^{2}

s denotes the semi-perimeter of the triangle ABC, ∆ its area and R the radius of the circle circumscribing the triangle ABC i.e., R is the circum-radius.

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