Home
Class 12
MATHS
If sintheta=(-4)/(5) and theta lies in t...

If `sintheta=(-4)/(5) and theta` lies in third quadrant, then the value of `cos""(theta)/(2)` is

A

`1/sqrt(5)`

B

`1/sqrt(10)`

C

`-1/sqrt(5)`

D

`-1/sqrt(10)`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • TRIGNOMETRIC FUNCTIONS

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

  • TRIGNOMETRIC FUNCTIONS

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

  • TRIGNOMETRIC FUNCTIONS

    AAKASH INSTITUTE ENGLISH|Exercise Try Yourself|32 Videos

  • THREE DIMENSIONAL GEOMETRY

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION - J|10 Videos

  • VECTOR ALGEBRA

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

Similar Questions

Explore conceptually related problems

If "sin"theta=-4/(5) and theta lies in third quadrant, then the value of "cos"theta/(2) is

If tantheta=3 and theta lies in third quadrant then sintheta=

If tantheta=3 and theta lies in third quadrant then sintheta=

If tan theta=(1)/sqrt(5) and theta lies in the first quadrant, the value of cos theta is :

If sinalpha=-(3)/(5) and alpha lies in the third quadrant then find the value of cos.(alpha)/(2)

If sintheta=(12)/(13)a n d\ theta lies in the second quadrant, find the values of s e ctheta+t a nthetadot

If cos theta = 3/5 and theta lies in the fourth quadrant, find the value of cosec theta + cot theta.

If sin theta = 12/13 and theta lies in the second quadrant, find the value of sec theta+tan theta .

If sintheta+costheta=0 and theta lies in the fourth quadrant, find sintheta and costheta

If theta lies in second quadrant, then the quadrant in which -theta/(2) lies is

AAKASH INSTITUTE ENGLISH-TRIGNOMETRIC FUNCTIONS -Assignment section-A (Objective Type Questions (One option is correct))
  1. If sintheta +costheta =1, then the value of sin2theta is equal to

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  5. The value of tan75^(@) =

    Text Solution

    |

  6. If omega is a non-real cube root of unity and n is not a multiple o...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  11. The general solution of tan3x=1 is

    Text Solution

    |

  12. If sin theta =sqrt(3) cos theta, -pi lt theta lt 0, then the value of ...

    Text Solution

    |

  13. Number of solution of the equation tanx+secx=2cosx lying in the interv...

    Text Solution

    |

  14. If the lengths of the sides of a triangle are 3, 5, 7, then its larges...

    Text Solution

    |

  15. The value of sin^2 75^0-sin^2 15^0 is a. 1//2 b. sqrt(3)//2 c. 1 d. 0

    Text Solution

    |

  16. If a cosA=b cosB, then triangleABC is

    Text Solution

    |

  17. If a=16, b=24 and c=20, then the value of cos(B/2) is

    Text Solution

    |

  18. If a=1+sqrt(3), b=2 and c=sqrt(2), then the measure of angleB is

    Text Solution

    |

  19. If angleA=60^(@), b=2 and c=4, then the value of a is

    Text Solution

    |

  20. If b=sqrt(3), c=1 and angleA=30^(@), then the measure of angleB is

    Text Solution

    |