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Prove that b^2 + c^2 -a^2 = bc, then A = 60^@

Answer»

SOLUTION :`b^2 + c^2 -a^2 = BC`
or, `(b^2 + c^2 -a^2)/(ABC) = 1/2` or COSA = 1/2 or A = `60^@`


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