Home
Class 12
MATHS
cos 12^(circ)+cos 84^(circ)+cos 156^(cir...

`cos 12^(circ)+cos 84^(circ)+cos 156^(circ)+cos 132^(circ)=`

A

`(1)/(2)`

B

1

C

`-(1)/(2)`

D

8

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • MAXIMA AND MINIMA

    HIMALAYA PUBLICATION|Exercise QUESTION BANK|167 Videos

  • Pair Of Lines

    HIMALAYA PUBLICATION|Exercise QUESTION BANK|129 Videos

Similar Questions

Explore conceptually related problems

cos 20^(circ) cos 40^(circ) cos 60^(circ) cos 80^(circ)=

cos 40^(circ)+cos 80^(circ)+cos 160^(circ)+cos 240^(circ)=

cos 1^(circ)+cos 2^(circ)+cos 3^(circ)+...+cos 180^(circ)=

cot 12^(circ) cot 102^(circ)+cot 102^(circ) cot 66^(circ) +cot 66^(circ) cot 12^(circ)

sin 12^(circ) .sin 48^(circ) .sin 54^(circ)=

cos ^(2) 73^(circ)+cos ^(2) 47^(circ)+cos 73^(circ) . cos 47^(circ)=

The value of sin 20^(circ) sin 40^(circ) sin 60^(circ) sin 80^(circ) is

sqrt(3) cot 20^(circ)-4 cos 20^(circ)=

cos ^(2) 5^(circ)+cos ^(2) 10^(circ)+cos ^(2) 15^(circ)+….+cos ^(2) 90^(circ)=

sin 47^(circ)+sin 61^(circ)-sin 11^(circ)-sin 25^(circ)=

HIMALAYA PUBLICATION-MEASUREMENT OF ANGLES, TRIGONOMETRIC RATIOS AND RELATION BETWEEN SIDES AND ANGLES OF A TRIANGLE-QUESTION BANK
  1. The value of tan 75^(circ)-cot 75^(circ) is equal to

    Text Solution

    |

  2. Sin (45^(@)+theta)-cos(45^(@)-theta) is equal to :

    Text Solution

    |

  3. cos 12^(circ)+cos 84^(circ)+cos 156^(circ)+cos 132^(circ)=

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  6. The value of sin 50^(circ)-sin 70^(circ)+sin 10^(circ) is equal to

    Text Solution

    |

  7. If sin theta+cos theta=1 then the value of sin 2 theta is equal to

    Text Solution

    |

  8. If alpha+dot(beta)=(pi)/(4), then the value of (1+tan alpha)(1+tan bet...

    Text Solution

    |

  9. If sin theta=-(4)/(5) and theta lies in 3 quadrant then the value of c...

    Text Solution

    |

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

    Text Solution

    |

  11. If A lies in the second quadrant and 3 tan A+4=0 then the value of 2 c...

    Text Solution

    |

  12. The value of cos ^(2) 48^(circ)-sin ^(2) 12^(circ) is

    Text Solution

    |

  13. If tan alpha=(1)/(7), tan beta=(1)/(3), then cos 2 alpha is equal to

    Text Solution

    |

  14. If tan theta=(a)/(b), then b cos 2 theta+a sin 2 theta is equal to

    Text Solution

    |

  15. In a triangle A B C, hat(A)=30^(circ), b=8, a=6, then b=sin ^(-1) x, w...

    Text Solution

    |

  16. In the triangle A B C, a=13, b=14, c=15 then sin (A)/(2)=

    Text Solution

    |

  17. If tan A=(1)/(3), tan B=(2)/(7) then cot (A+B)=

    Text Solution

    |

  18. If (cos A )/( a ) =(cos B)/(b)=(cos C)/(c) then the DeltaABC is

    Text Solution

    |

  19. In a triangle A B C, if a, b, c are in A.P then tan (A)/(2), tan (B)/(...

    Text Solution

    |

  20. 4 cos 36^(circ)+cot (7 (1)/(2))^(circ)=

    Text Solution

    |