Home
Class 12
MATHS
If cos B=(c ^(2) +a^(2)-b^(2))/(2xc) , t...

If `cos B=(c ^(2) +a^(2)-b^(2))/(2xc) ,` then the value of x is

A

ab

B

b

C

2b

D

a

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • MCQ's

    CHHAYA PUBLICATION|Exercise QUESTION PAPER 5|89 Videos

  • MCQ's

    CHHAYA PUBLICATION|Exercise QUESTION PAPER 7|90 Videos

  • MCQ's

    CHHAYA PUBLICATION|Exercise QUESTION PAPER 33|1 Videos

  • MCQ ZONE 3

    CHHAYA PUBLICATION|Exercise Question Paper 8|30 Videos

  • Measures of Central Tendency

    CHHAYA PUBLICATION|Exercise Exercise 2 C Very short answer type question|18 Videos

Similar Questions

Explore conceptually related problems

In triangle ABC if a^(4) + b^(4) + c^(4) = 2a^(2)b^(2) + 2b^(2)c^(2) then the values of B will be-

If intx^2dote^(-2x)dx=e^(-2x)(a x^2+b x+c)+d , then the value of |a/(b c)| is______

Let A=[[3x^2], [1], [6x]],B=[a,b,c] and C=[[(x+2)^2, 5x^2, 2x],[5x^2, 2x,(x+2)^2],[ 2x,(x+2)^2, 5x^2]] be three given matrices, where a ,b ,ca n dx in Rdot Given that tr(AB)=tr(C). If f(x)=a x^2+b x+c , then the value of f(1) is ______.

If in a triangle ABC, a cos ^(2)""C/2+ c cos ^(2)""A/2=(3b)/(2), then the sides a, b and c-

Suppose a ,b ,c in I such that the greatest common divisor for x^2+a x+b and x^2+bx+c is (x+1) and the least common multiple of x^2+a x+b and x^2+b x+c is (x^3-4x^2+x+6) . Then the value of |a+b+c| is equal to ___________.

The co-ordinate of vertex and focus of a parabola x^2 + by^2 + 2hxy+ 2gx + 2fy + c = 0 are (2, 4) and (6, 2) . Find the the value of b, h, g. f, c .

In a triangle ABC, if a, b, c are in A.P. and (b)/(c) sin 2C + (c)/(b) sin 2B + (b)/(a) sin 2A + (a)/(b) sin 2B = 2 , then find the value of sin B

CHHAYA PUBLICATION-MCQ's-QUESTION PAPER 3
  1. The value of (cos 1^(@) +cos 2^(@) +cos 3^(@)+…+cos 180^(@)) is -

    Text Solution

    |

  2. The number of solutions of tan x+ sec x=2 cos x in (0, 2pi) is

    Text Solution

    |

  3. If cos B=(c ^(2) +a^(2)-b^(2))/(2xc) , then the value of x is

    Text Solution

    |

  4. If cos (x-y)+1=0, then the value of (cos x+ cos y) and (sin x+sin y) i...

    Text Solution

    |

  5. The measures of the sides of a triangle are 3,5 and 7 then the greates...

    Text Solution

    |

  6. If sin x+ sin y+ sin z=3, then the value of (cos x+ cos y+ cos z) is-

    Text Solution

    |

  7. If cos A = 1/7 and cos B =""13/14 where A and B both are acute angles,...

    Text Solution

    |

  8. (sec 50^(@)+tan 50^(@)) is equal to-

    Text Solution

    |

  9. The value of cosec ^(2) theta cot ^(2) theta - sec ^(2) theta tan ^(2)...

    Text Solution

    |

  10. If the angles of a triangle are in the ratio 4:1:1, then the ratio of ...

    Text Solution

    |

  11. If pi lt A lt (3pi)/(2) and tan A""=4/3, then the value of (5 sin 2A +...

    Text Solution

    |

  12. The maximum value of (4 sin ^(2)x + 3 cos ^(2) x) is-

    Text Solution

    |

  13. If sin 6 theta =32 cos ^(5) theta sin theta -32 cos ^(3) theta sin the...

    Text Solution

    |

  14. If w=x+y+z then (sin x+ sin y+ sin z- sin w) is equal to-

    Text Solution

    |

  15. If sin theta + cos theta = m and sin ^(3) theta + cos ^(3) theta =n, s...

    Text Solution

    |

  16. If alpha =(pi)/(18) radian then the value of (cos alpha + cos 2 alpha+...

    Text Solution

    |

  17. The sides of a triangle are sin alpha, cos alpha and sqrt(1+ sin alpha...

    Text Solution

    |

  18. In a triangle ABC if b=2, B=30^(@), then the area of the circumcircal ...

    Text Solution

    |

  19. The value of cot (82(1)/(2))^(@) is-

    Text Solution

    |

  20. If tan theta + sec theta=4, then the value of sin theta (0 lt theta l...

    Text Solution

    |