Home
Class 12
MATHS
The minimum value of 8(cos2theta+cos the...

The minimum value of `8(cos2theta+cos theta)` is equal to

A

`-17`

B

`-9`

C

3

D

`-8`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • TRIGNOMETRIC FUNCTIONS

    AAKASH INSTITUTE|Exercise Section-C (Objective Type Questions More than one options are correct )|45 Videos

  • TRIGNOMETRIC FUNCTIONS

    AAKASH INSTITUTE|Exercise Section D (Linked Comprehension Type Questions)|24 Videos

  • TRIGNOMETRIC FUNCTIONS

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

  • THREE DIMENSIONAL GEOMETRY

    AAKASH INSTITUTE|Exercise ASSIGNMENT SECTION - J|10 Videos

  • VECTOR ALGEBRA

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

Similar Questions

Explore conceptually related problems

The minimum value of 8(cos2 theta+cos theta) is equal to

The minimum value of (cos theta-sin theta ) is

The minimum value of (cos theta-sin theta) is

The minimum value of sin^2 theta + cos^4 theta is

The minimum value of a sin theta+b cos theta is:

The minimum value of cos^(2)theta+sec^(2)theta is

The minimum value of 24sin theta-7cos theta is

The minimum value of 7cos theta+24sin theta is

The minimum value of cos2theta +costheta for all values of theta is :

AAKASH INSTITUTE-TRIGNOMETRIC FUNCTIONS -Section-B (Objective Type Questions One option is correct)
  1. If A, B, C are in A.P., then correct relation is cotA=(sinB+sinC)/(co...

    Text Solution

    |

  2. cos(pi/14)+cos((3pi)/14)+cos((5pi)/14)=kcot(pi/14) then k is equal t...

    Text Solution

    |

  3. The minimum value of 8(cos2theta+cos theta) is equal to

    Text Solution

    |

  4. If 4nalpha =pi then cot alpha cot 2 alpha cot 3alpha ...cot (2n-1)alph...

    Text Solution

    |

  5. The value of tan7 1/2^@ equal to

    Text Solution

    |

  6. If tanalpha=sqrt(a), where a is a rational number whch is not a perfec...

    Text Solution

    |

  7. The value of 2tan18^@+3sec18^@-4cos18^@ is

    Text Solution

    |

  8. If tan^2alpha-2tan^2beta=1 then which of the following options is corr...

    Text Solution

    |

  9. The value of tan10^@tan50^@tan70^@ is

    Text Solution

    |

  10. If the arcs of the same length in two circles subtend angles 65 and 11...

    Text Solution

    |

  11. If cos2x+2cosx=1 then sin^2x(2-cos^2x) is

    Text Solution

    |

  12. The value of tan(theta/2)(1+sectheta)(1+sec2theta)+(1+sec2^2theta).......

    Text Solution

    |

  13. The value of [100(x-1)] is where [x] is the greatest integer less tha...

    Text Solution

    |

  14. If alpha+beta=pi/2a n dbeta+gamma=alpha, then tanalpha equals 2(tanbet...

    Text Solution

    |

  15. If f(alpha,beta)=cos^2alpha+sin^2alphacos2beta then which of the follo...

    Text Solution

    |

  16. Let f(x)=cos10x+cos8x+3cos4x+3cos2x and g(x)=8cosxcos^3(3x) then for a...

    Text Solution

    |

  17. Prove that sum(r=1)^n(1/(costheta+"cos"(2r+1)theta))=(sinntheta)/(2sin...

    Text Solution

    |

  18. Find the square root of 5-12i

    Text Solution

    |

  19. Given that sum(k=1)^35 sin5k^@ = tan(m/n)^@ , where m and n are relat...

    Text Solution

    |

  20. For -pi/2 lt theta lt pi/2, (sintheta + sin 2theta)/(1+costheta + cos2...

    Text Solution

    |