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The expression ((a+b+c)(b+c-a)(c+a-b)(a...

The expression `((a+b+c)(b+c-a)(c+a-b)(a+b-c))/(4b^2 c^2)` for a triangle ABC is equal to

A

`cos^2 A `

B

`sin^2 A`

C

`cos B cos C`

D

`sin B sin C`

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The correct Answer is:
B
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