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If n is an odd positive interger, then ...

If n is an odd positive interger, then
`((cosA+cosB)/(sinA-sinB))^(n)+((sinA+sinB)/(cosA-cosB))^(n)=`

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-TRIGONOMETRIC RATIOS AND IDENTITIES-Chapter Test
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  8. If A = sin^2 theta+ cos^4 theta, then for all real values of theta

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  11. If A+B+C=pi then sin2A+sin2B+sin2C=

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  12. The expression tan^2alpha+cot^2alpha is

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  13. If alpha + beta+gamma=pi, prove that sin^2 alpha + sin^ beta - sin^2 g...

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  14. If tan((alphapi)/(4))=cot((betapi)/(4)), then

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  15. The roots of the equation 4x^2-2sqrt5 x +1=0 are .

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  17. If (cosA)/(cosB)=n and (sinA)/(sinB)=m,then (m^(2)-n^(2))sin^(2)B=

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  18. If tantheta+tan(theta+pi/3)+tan(theta-pi/3)=ktan3theta then k is equal...

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