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Prove that ((cos A+cos B)/(sinA-sinB))^(...

Prove that `((cos A+cos B)/(sinA-sinB))^(n)+((sinA+sinB)/(cos A-cosB))^(n)`
`=2cot^(n)""(A-B)/(2)` or 0, accordingly as n is even or odd.

A

`-1`

B

1

C

0

D

none of these

Text Solution

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The correct Answer is:
C
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OBJECTIVE RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS AND IDENTITIES-Chapter Test
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