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(sin (n +1) A + 2 sin n A + sin (n-1) A)...

`(sin (n +1) A + 2 sin n A + sin (n-1) A)/( cos ( n -1) A - cos (n +1) A)= `

A

`tan A //2`

B

`cot A//2`

C

`tan A`

D

`cot A`

Text Solution

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The correct Answer is:
B
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