Home
Class 12
MATHS
the value of sin(pi/7)+sin((2pi)/7)+sin(...

the value of `sin(pi/7)+sin((2pi)/7)+sin((3pi)/7)` is

A

`cos""(pi)/(14)`

B

`1/2cos""(pi)/(14)`

C

`tan""(pi)/(14)`

D

`1/2tan""(pi)/(14)`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRIC RATIOS AND IDENTITIES

    OBJECTIVE RD SHARMA|Exercise Chapter Test|60 Videos

  • TRIGONOMETRIC RATIOS AND IDENTITIES

    OBJECTIVE RD SHARMA|Exercise Section II - Assertion Reason Type|13 Videos

  • TRIGONOMETRIC EQUATIONS AND INEQUATIONS

    OBJECTIVE RD SHARMA|Exercise Chapter Test|60 Videos

Similar Questions

Explore conceptually related problems

The value of 2 sin (pi/8) sin((2pi)/8) sin((3pi)/8) sin ((5pi)/8) sin ((6pi)/8) sin((7pi)/8) is :

the value of sin((pi)/(7))+sin((2 pi)/(7))+sin((3 pi)/(7)) is

Find the value of sin((pi)/(7))sin((2 pi)/(7))sin((4 pi)/(7))=

The value of sin""(2pi)/(7)+sin""(4pi)/(7)+sin""(8pi)/(7), is

Show that: sin((2pi)/7)+ sin ((4pi)/7) + sin( (8pi)/7) = sqrt7/2 .

The value of sin(pi)/(14)sin(3 pi)/(14)sin(5 pi)/(14)sin(7 pi)/(14)sin(9 pi)/(14)sin(11 pi)/(14)sin(13 pi)/(14) is equal to

The value of sin""(15pi)/(32)sin""(7pi)/(16)sin""(3pi)/(8), is

OBJECTIVE RD SHARMA-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
  1. The vlaue of cosec^(2)""(pi)/(7)+cosec^(2)""(2pi)/(7)+cosec^(2)""(3pi)...

    Text Solution

    |

  2. sin1 2^(@)sin4 8^(@)sin5 4^(@)=

    Text Solution

    |

  3. the value of sin(pi/7)+sin((2pi)/7)+sin((3pi)/7) is

    Text Solution

    |

  4. cos^6pi/9-33tan^4pi/9+27tan^2pi/9 is equal to 0 (b) sqrt(3) (c) 3 ...

    Text Solution

    |

  5. (sin^2 3A)/(sin^2A)-(cos^2 3A)/(cos^2A)=

    Text Solution

    |

  6. If sinA=(336)/(625)where450^(@)ltAlt540^(@), then sin""(A)/(4)=

    Text Solution

    |

  7. If y=(tanx)/(tan3x), then

    Text Solution

    |

  8. The value of cot^(2)""(pi)/(7)+cot^(2)""(2pi)/(7)+cot^(2)""(3pi)/(7), ...

    Text Solution

    |

  9. The value of sin""(pi)/(7)sin""(2pi)/(7)sin""(3pi)/(7), is

    Text Solution

    |

  10. The value of sin""(2pi)/(7)+sin""(4pi)/(7)+sin""(8pi)/(7), is

    Text Solution

    |

  11. cos""(2pi)/(15)cos""(4pi)/(15)cos""(8pi)/(15)cos""(16pi)/(15)=(1)/(16)

    Text Solution

    |

  12. If sinA+cosA=m an sin^(3)A+cos^(3)A=n, then

    Text Solution

    |

  13. If cosA+cosB=m and sinA+sinB=n then sin(A+B)=

    Text Solution

    |

  14. If ltA lt(pi)/(6) and sinA+cosA=(sqrt7)/(2),"then" tan""(A)/(2)=

    Text Solution

    |

  15. The value of cos""(pi)/(11)+cos""(3pi)/(11)+cos""(5pi)/(11)+cos""(7pi)...

    Text Solution

    |

  16. If n=pi/(4alpha), then tanalpha tan 2alpha tan 3 alpha........tan(2n-1...

    Text Solution

    |

  17. the value of tan9^@-tan2 7^@-tan6 3^@+tan8 1^@ is equal to

    Text Solution

    |

  18. For x in R, tanx+1/2tan""(1)/(2^(2))tan""(x)/(2^(2))+...+(1)/(2^(n-1...

    Text Solution

    |

  19. If (tan3A)/(tanA)=k, then (sin3A)/(sinA)=

    Text Solution

    |

  20. If y=(sec^(2)theta-tantheta)/(sec^(2)theta+tantheta)'then

    Text Solution

    |