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The expression [(1+itanalpha)/(1-itanal...

The expression `[(1+itanalpha)/(1-itanalpha)]^n-(1+itannalpha)/(1-itannalpha)` when simplified reduces to

A

zero

B

`2 sin n alpha`

C

`2 cos n alpha`

D

None of these

Text Solution

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The correct Answer is:
A
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