Home
Class 11
MATHS
If cosA=3/4, then 32 sin, A/2 sin, (5A)/...

If `cosA=3/4, then 32 sin, A/2 sin, (5A)/2=` (A) `sqrt(11)` (B) `-sqrt(11) (C) 11 (D) -11

A

`sqrt7`

B

`-sqrt7`

C

7

D

`-7`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • FACTORIZATION FORMULAE

    TARGET PUBLICATION|Exercise EVALUATION TEST|8 Videos

  • FACTORIZATION FORMULAE

    TARGET PUBLICATION|Exercise CRITICAL THINKING|34 Videos

  • CIRCLE AND CONICS

    TARGET PUBLICATION|Exercise EVALUATION TEST|28 Videos

  • PROBABILITY

    TARGET PUBLICATION|Exercise EVALUATION TEST|8 Videos

Similar Questions

Explore conceptually related problems

Slove (3-sqrt(11)) (3+ sqrt(11))

Multiply 5 sqrt(11) by 3sqrt(11)

If cosA=(3)/(4) and k sin ((A)/(2))sin((5A)/(2))=(11)/(8) . Find k.

(sqrt(11)+sqrt(2))/(9)=

sqrt(x-4)+3=sqrt(x+11)

if cos^(-1)((2)/(3x))+cos^(-1)((3)/(4x))=(pi)/2, x>3/4 then x= (a) (sqrt(145))/(11) (b) (sqrt(145))/(12) (c) (sqrt(146))/(10) (d) (sqrt(146))/(11)

If [(2,1),(3,2)] A[(-3,2),(5,-3)]=[(1,0),(0,1)] then a is equal to (A) [(0,1),(1,1)] (B) [(1,0),(1,1)] (C) [(1,1),(1,0)] (D) [(1,1),(0,1)]

Simplify (sqrt(11)+sqrt(8))(sqrt(11)-2sqrt(2))

sqrt(x+4)+sqrt(x+20)=2sqrt(x+11)

sqrt(15^(2)+11xx3^(2))=?

TARGET PUBLICATION-FACTORIZATION FORMULAE-COMETITIVE THINKING
  1. If cos x=3, cos y, then 2 tan ((y-x)/(2))=

    Text Solution

    |

  2. If cosA=mcosB, then

    Text Solution

    |

  3. The sum S= sin theta + sin 2 theta + …+ sin n theta, equals

    Text Solution

    |

  4. cos.(2pi)/(7)+cos.(4pi)/(7)+cos.(6pi)/(7)

    Text Solution

    |

  5. If cosA=3/4, then 32 sin, A/2 sin, (5A)/2= (A) sqrt(11) (B) -sqrt(11) ...

    Text Solution

    |

  6. sin 12^(@) sin 48^(@) sin 54^(@) is equal to

    Text Solution

    |

  7. sin12^@sin24^@sin48^@sin84^@=

    Text Solution

    |

  8. (1+cos.(pi)/(8))(1+cos.(3pi)/(8))(1+cos.(5pi)/(8))(1+cos.(7pi)/(8)) is...

    Text Solution

    |

  9. If mtan(theta-30^0)=ntan(theta+120^0) then (m+n)/(m-n) is equal to

    Text Solution

    |

  10. The vlaue of cos^(2)76^(@)+cos^(2)16-cos76^(@)cos16^(@),is

    Text Solution

    |

  11. 2 sin ^(2) beta + 4 cos (alpha + beta) sin alpha sin beta + cos 2 (alp...

    Text Solution

    |

  12. In triangle ABC, the value of sin 2A + sin 2B+ sin 2C is equal to

    Text Solution

    |

  13. If A+B+C=pi and cosA=cosBcosC then tanBtanC is equal to

    Text Solution

    |

  14. If A,B ,C are the angle of Delta ABC then cot A .cot B + c...

    Text Solution

    |

  15. If A+B+C=180^@ then the value of (cotB+cotC)(cotC+cotA)(cotA+cotB) wil...

    Text Solution

    |

  16. If A+b+C=pi then (tanA+tanB+tanC)/(tanAdota n BdottanC)

    Text Solution

    |

  17. In a triangle ABC angle A=pi/2 then cos^2B+cos^2C=

    Text Solution

    |

  18. If A+B+C=180^(@), then the value of cot.(A)/(2)+cot.(B)/(2)+cot.(C)/(2...

    Text Solution

    |

  19. Let A, B and C are the angles of a plain triangle and tan(A/2)=1/3...

    Text Solution

    |

  20. In any triangle ABC. sin ^(2) ""A/2 + sin ^(2) ""B/2 + sin ^(2) ""C/2 ...

    Text Solution

    |