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If 4nalpha=pi, thencotalpha cot2alpha co...

If `4nalpha=pi`, then`cotalpha cot2alpha cot3alpha.... cot(2n-1)alpha` is equal to

A

0

B

1

C

n

D

`n^2`

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The correct Answer is:
B
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PATHFINDER-TRIGONOMETRIC RATIOS AND IDENTITIES-QUESTION BANK
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  2. (sin5theta+sin2theta-sintheta)/(cos5theta+2cos3theta+2cos^2theta+costh...

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  3. If 4nalpha=pi, thencotalpha cot2alpha cot3alpha.... cot(2n-1)alpha is ...

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  4. If thetane(2n+1)pi/2. ninI, then the least value of (sintheta+cosecthe...

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  5. If sinx+sin^2x=1n then the value of cos^12x+3cos^10x+3cos^8x+cos^6x-1 ...

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  6. If "coses"theta-sintheta=m,sectheta-costheta=n,"eliminate"theta

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  7. Find the value of (1+cos (pi/8))(1+cos(3pi/8))(1+cos(5pi/8))(1+cos(7pi...

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  8. (cos^4(pi/8))+(cos^4((3pi)/8))+(cos^4((5pi)/8))+(cos^4((7pi)/8)) is

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  9. The value of underset(r=1)overset9sum sin^2(rpi)/18=

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  10. If A+B+C=(3pi)/2, then cos2A +cos2B+cos2C is

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  11. The number of points of intersection of 2y=1 and y=sinx, -2pilexle2pi

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  12. If sinalpha, sinbeta and cosalpha are in G.P. then roots of the equati...

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  13. If x=secphi-tanphi and y=cosecphi+cotphi, then

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  14. For any triangle ABC, ((a+b+c)(b+c-a)(c+a-b)(a+b-c))/(4b^2c^2)is equa...

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  15. Which one is correct?

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  16. In a DeltaABC, if cotAcotBcotCgt0, then the Delta is

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  17. cos(pi/14) + cos ((3pi)/14) + cos((5pi)/14)=

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  18. If (2sinalpha)/(1+cosalpha+sinalpha)=x, then (1-cosalpha+sinalpha)/(1+...

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  19. If secalpha and cosecalpha are two roots of x^2-px+q=0 then

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  20. If costheta + sectheta = (-2) then cos^ntheta + sec^ntheta= (If n is e...

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