Prove that ((a+b+c)(b+c-a)(c+a-b)(a+b-c)...

Prove that `((a+b+c)(b+c-a)(c+a-b)(a+b-c))/(4b^2c^2)=sin^2A`

A

`cos ^(2)A`

B

`sin^(2)A`

C

`cos A cos B cos C`

D

None of these

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