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Find the value of cot""(pi)/20.cot""(3pi...

Find the value of `cot""(pi)/20.cot""(3pi)/20.cot""(5pi)/20.cot""(7pi)/20.cot""(9pi)/20`

A

`-1`

B

1

C

`(1)/(2)`

D

0

Text Solution

Verified by Experts

The correct Answer is:
B
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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-TRIGONOMETRY -EXERCISES (Multiple Choice Questions)
  1. The value of tan10^(@)tan15^(@)tan75^(@)tan80^(@) is

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  2. tan""(pi)/(8)tan""(pi)/(12)tan""(3pi)/(8)tan""(5pi)/(12)-sin^(2)""(pi)...

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  3. Find the value of cot""(pi)/20.cot""(3pi)/20.cot""(5pi)/20.cot""(7pi)/...

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  4. Solve sqrt(2+sqrt(2+sqrt(2+2cos16theta)))

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  5. Find the value of tan70^(@).

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  6. Find the value of tan80^(@)

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  7. If tan((pi)/(2)-(theta)/(2))=sqrt(3), then the value of costheta is.

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  8. If A, B and C be the angles of a triangle, then which of the following...

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  9. If cosecA=2, then (1)/(tanA)+(sinA)/(1+cosA)=?

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  10. If tanA=sqrt(2)-1, then sin2A = ?

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  11. (5sin^(2)30^(@)+cos^(2)45^(@)-4tan^(2)30^(@))/(2sin30^(@).cos30^(@)+ta...

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  12. (cos(90^(@)-theta).sec(90^(@)-theta).tantheta)/(cosec(90^(@)-theta).si...

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  13. If alpha is in first quadrant such that tan^(2)alpha=(8)/(7), then the...

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  14. (kcosec^(2)30^(@).sec^(2)45)/(8cos^(2)45^(@).sin^(2)60^(@))=tan^(2)60^...

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  15. If alpha is in Ist quadrant such that sec^(2)alpha=3, then (tan^(2)alp...

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  16. If 5alpha and 4alpha are in Ist quadrant such that sin5alpha=cos4alpha...

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  17. If (sintheta+cosectheta)^(2)+(costheta+sectheta)^(2)=K+tan^(2)theta+co...

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  18. (sinalpha+secalpha)^(2)+(cosalpha+cosecalpha)^(2)=(K+secalphacosecalph...

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  19. (sintheta)/(cottheta+cosectheta)-(sintheta)/(cottheta-cosectheta)=?

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  20. If (tanA)/(1-cotA)+(cotA)/(1-tanA)=K+tanA+cotA then K = ?

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