Home
Class 12
MATHS
Find the value of cos 12^(@)+cos 84^(@)+...

Find the value of `cos 12^(@)+cos 84^(@)+cos 156^(@)+cos 132^(@)`

A

`1/2`

B

1

C

`-1/2`

D

`1/8`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • TRIGNOMETRIC FUNCTIONS

    AAKASH INSTITUTE|Exercise Assignment Section-B (Objective Type Questions (One option is correct))|1 Videos

  • TRIGNOMETRIC FUNCTIONS

    AAKASH INSTITUTE|Exercise Section-B (Objective Type Questions One option is correct)|131 Videos

  • TRIGNOMETRIC FUNCTIONS

    AAKASH INSTITUTE|Exercise Try Yourself|32 Videos

  • THREE DIMENSIONAL GEOMETRY

    AAKASH INSTITUTE|Exercise ASSIGNMENT SECTION - J|10 Videos

  • VECTOR ALGEBRA

    AAKASH INSTITUTE|Exercise SECTION-J (Aakash Challengers Questions)|5 Videos

Similar Questions

Explore conceptually related problems

find the values of (1)cos12^(@)+cos84^(@)+cos156^(@)+cos132^(@)

Find the value of cos12^(@)+cos84^(@)+cos156^(@)+cos132^(@)

The value of cos12^(@)+cos84^(@)+cos156^(@)+cos132^(@) is

Find the value of cos12^(0)+cos84^(@)+cos156^(@)+cos132^(@)

The value of cos12^(0)+cos84^(0)+cos156^(@)+cos132^(@)is

Find the value of cos[12^(@)]-sin[78^(@)]

AAKASH INSTITUTE-TRIGNOMETRIC FUNCTIONS -Assignment section-A (Objective Type Questions (One option is correct))
  1. The value of (1-tan^(2)15^(@))/(1+tan^(2)15^(@)) is

    Text Solution

    |

  2. If (1+tantheta)(1+tanphi)=2, then theta + phi=

    Text Solution

    |

  3. Find the value of cos 12^(@)+cos 84^(@)+cos 156^(@)+cos 132^(@)

    Text Solution

    |

  4. The value of sin 50^(@) - sin70^(@) + sin 10^(@) is equal to

    Text Solution

    |

  5. The value of sinpi/18+sinpi/9+sin(2pi)/9+sin(5pi)/18 is

    Text Solution

    |

  6. The value of sin""(pi)/(10)sin""(13pi)/(10) is

    Text Solution

    |

  7. In a triangleABC, if sinA - cosB = cos C, then the measured of angleB ...

    Text Solution

    |

  8. The value of cos1^(@) cos 2^(@) ..............cos179^(@) is

    Text Solution

    |

  9. 2cos(pi/13)cos(9pi/13)+cos(3pi/13)+cos(5pi/13)=0

    Text Solution

    |

  10. If sintheta +costheta =1, then the value of sin2theta is equal to

    Text Solution

    |

  11. If tan A=1/2 and tan B=1/3, then tan(A +B) is equal to

    Text Solution

    |

  12. The minute hand of a watch is 3cm long. How far does its tip move in 2...

    Text Solution

    |

  13. If sintheta=(-4)/(5) and theta lies in third quadrant, then the value...

    Text Solution

    |

  14. The value of tan75^(@) =

    Text Solution

    |

  15. If 1,omega , omega^2 are the cube roots of unity , then Delta=|(1,ome...

    Text Solution

    |

  16. The value of 2sinA cos^(3)A -2sin^(3)A cosA is

    Text Solution

    |

  17. If tanalpha=(sqrt(3)+1)/(sqrt(3)-1), then the expression cos 2alpha +(...

    Text Solution

    |

  18. If sin^2 theta=1/4 , then the value of theta is

    Text Solution

    |

  19. The solution of the equation cos^2theta+sintheta+1=0 lies in the inter...

    Text Solution

    |

  20. The general solution of tan3x=1 is

    Text Solution

    |