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Prove that: ((cosA+cos B)/(sinA-s inB))^...

Prove that: `((cosA+cos B)/(sinA-s inB))^n+((sinA+s inB)/(cosA-cosB))^n={2cot^n((A-B)/2),ifni se v e n0,ifni sod d,`

A

`2 tan^(n)"" ( A-B)/(2)`

B

`2 cot^(n) "" ( A-B)/(2)`

C

0

D

none

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The correct Answer is:
B, C
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