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For any triangle ABC, ((a+b+c)(b+c-a)(c...

For any triangle ABC,
`((a+b+c)(b+c-a)(c+a-b)(a+b-c))/(4b^2c^2)`is equal to

A

cos2a

B

1+cosA

C

1-cosA

D

`sin^2A`

Text Solution

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The correct Answer is:
D
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