Home
Class 12
MATHS
cos theta + cos (120^(@) + theta ) + cos...

`cos theta + cos (120^(@) + theta ) + cos (120^(@) - theta )=`

A

0

B

1

C

`1//4`

D

`3//4`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRIC RATIOS AND IDENTITIES

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 1 C ( MULTIPLE AND SUBMULTIPLE ANGLES )|118 Videos

  • TRIGONOMETRIC RATIOS AND IDENTITIES

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 1 D ( TRANSFORMATIONS )|94 Videos

  • TRIGONOMETRIC RATIOS AND IDENTITIES

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 1 A ( TRIGONOMETRIC FUNCTIONS)|147 Videos

  • TRIGONOMETRIC EQUATIONS

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 (SPECIAL TYPE QUESTIONS) SET - 4|4 Videos

Similar Questions

Explore conceptually related problems

cos theta + cos (240^(@) + theta ) + cos (240^(@)- theta )=

cos theta - cos (60^(@) + theta ) - cos(60^(@) - theta )=

cos theta cos (60^(@) + theta ) * cos (60^(@) - theta ) =

cos^(3) theta + cos^(3) ( 120^(@) +theta ) + cos^(3) (120^(@) - theta )=

If cot theta = 8//15 and theta does not lie in the first quadrant , then cos (30^(@) + theta ) + sin (45^(@) - theta ) + cos(120^(@) + theta ) =

I : If x cos theta = y cos (120^@ + theta ) = z cos ( theta + 240^(@)) then xy+ yz+ zx=1 II : cos alpha + cos (120^(@) + alpha ) + cos (120^@ - alpha ) =0

DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 B ( COMPOUNDS ANGLES )
  1. In a DeltaPQR , if 3 sin P+4 cos Q=6 and 4 sin Q+3 cos P=1 , then the...

    Text Solution

    |

  2. If tan beta = 2 sin alpha sin gamma " cosec "(alpha + gamma) , then ...

    Text Solution

    |

  3. cos theta + cos (120^(@) + theta ) + cos (120^(@) - theta )=

    Text Solution

    |

  4. cos theta + cos (240^(@) + theta ) + cos (240^(@)- theta )=

    Text Solution

    |

  5. sin theta + sin (120^(@) + theta ) + sin ( theta - 120^(@))=

    Text Solution

    |

  6. cos theta - cos (60^(@) + theta ) - cos(60^(@) - theta )=

    Text Solution

    |

  7. cos 20^(@) + cos 100^(@) + cos 140^(@) =

    Text Solution

    |

  8. sin 40^(@) - sin 80^(@)+ sin 160^(@)=

    Text Solution

    |

  9. If A+B+C=0 , then tan A+ tan B+ tan C=

    Text Solution

    |

  10. If A+B+C=0 , then cot A cotB + cot B cot C+ cot C cot A =

    Text Solution

    |

  11. If A+C=B then tan A* tan B * tan C=

    Text Solution

    |

  12. If A+B+C = pi //2 , then tanA tanB + tanB tanC+ tan A tan C=

    Text Solution

    |

  13. If A=35^(@) , B= 15^(@) and C=40^(@) , then tan A* tan B+ tan B* tan...

    Text Solution

    |

  14. If ABC are angle of a triangle then prove that cot Acot B+ cot Bcot C+...

    Text Solution

    |

  15. If A+ B+C= pi//2 , " then " tan 2A + tan 2B+ tan 2C=

    Text Solution

    |

  16. If A+B+C= pi//2 then show that cot A + cot B+ cot C=cot A cot B cot C

    Text Solution

    |

  17. If A+B+C= pi//2 then show that cot A + cot B+ cot C=cot A cot B cot C

    Text Solution

    |

  18. If A+B+C=(pi)/2, " then " sum (cos (B+C))/(cos B cos C)=

    Text Solution

    |

  19. In Delta ABC, cos A + cos (B-C)=

    Text Solution

    |

  20. In Delta ABC, sin A + sin (B-C)=

    Text Solution

    |