Home
Class 12
MATHS
If : cos 6 theta + cos 4 theta + cos 2 t...

If `: cos 6 theta + cos 4 theta + cos 2 theta + 1 = 0`,
where, `0 lt theta lt 180^(@)`, then : `theta` =

A

`30^(@), 45^(@)`

B

`45^(@), 90^(@)`

C

`135^(@), 150^(@)`

D

`30^(@), 45^(@), 90^(@), 135^(@), 150^(@)`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRIC FUNCTIONS

    MARVEL PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS - PART-B: MASTERING THE BEST|27 Videos

  • TRIGONOMETRIC FUNCTIONS

    MARVEL PUBLICATION|Exercise MASTERING THE BEST - ALL TOPICS|128 Videos

  • TRIGONOMETRIC FUNCTIONS

    MARVEL PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS - PART - A : BUILDING-UP THE BASE (B) Properties of triangles|27 Videos

  • THREE DIMENSIONAL GEOMETRY

    MARVEL PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS|39 Videos

  • VECTORS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|20 Videos

Similar Questions

Explore conceptually related problems

1+cos2 theta+cos4 theta+cos6 theta=

If (cos^(2) theta)/(cot^(2) theta - cos^(2) theta) = 3 and 0^(@) lt theta lt 90^(@) , then the value of theta is

If sin theta = sqrt(3) cos theta, 0 lt theta lt 90^(@) , then theta is equal to .

Solve 5 cos 2 theta+2 "cos"^(2) theta/2 +1=0, -pi lt theta lt pi .

If (1/(1+cosec theta ) - 1/(1-cosec theta ))cos theta= 2 , 0^circ lt theta lt 90^circ , then the value of sin^(2) theta + cot^(2) theta + sec^(2) theta is: यदि (1/(1+cosec theta ) - 1/(1-cosec theta ))cos theta= 2 , 0^circ lt theta lt 90^circ , है,तो sin^(2) theta + cot^(2) theta + sec^(2) theta का मान हैः

MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS-MULTIPLE CHOICE QUESTIONS - PART - B : MASTERING THE BEST
  1. If : (tan 3 theta - 1)/(tan 3 theta + 1) = sqrt(3), then : theta =

    Text Solution

    |

  2. If : sin 5x + sin 3x + sin x = 0, where 0 lt x le (pi)/2, then : x =

    Text Solution

    |

  3. If : cos 6 theta + cos 4 theta + cos 2 theta + 1 = 0, where, 0 lt th...

    Text Solution

    |

  4. If : 0 lt theta lt pi/2 and sin 7theta + sin 4 theta + sin theta=0, th...

    Text Solution

    |

  5. Solve 5 cos 2 theta+2 "cos"^(2) theta/2 +1=0, -pi lt theta lt pi.

    Text Solution

    |

  6. "cot" theta = "sin" 2 theta, theta ne n pi, n in Z, "if" theta equals

    Text Solution

    |

  7. If : cot theta + cot((pi)/4 + theta) = 2, then : theta =

    Text Solution

    |

  8. If sin 3 alpha =4 sin alpha sin (x+alpha ) sin(x-alpha ) , then

    Text Solution

    |

  9. The number of values of x in the interval [0, 5pi] satisfying the equa...

    Text Solution

    |

  10. If, in triangleABC, (s-a)(s-b)=s(s-c), then: angleC=

    Text Solution

    |

  11. If, in a Delta ABC, (s - b)(s-c) = x cdot sin^(2) (A/2), then : x =

    Text Solution

    |

  12. In a Delta ABC, sin B : sin (A + B) =

    Text Solution

    |

  13. If, in a Delta ABC, c^(2) + a^(2) - b^(2) = ac, then : /B =

    Text Solution

    |

  14. In a Delta ABC, if : a = 16, b = 24 and c = 20 then : cos(B/2) =

    Text Solution

    |

  15. In Delta ABC, cscA (sin B cos C + cos B sin C) =

    Text Solution

    |

  16. If sides a,b,c of Delta ABC are in A.P., then : sin (A/2) cdot sin (C...

    Text Solution

    |

  17. If, in a Delta ABC, a = 6cm , b = 8 cm, c = 10cm, then : sin 2A =

    Text Solution

    |

  18. In DeltaABC if /C=90^@ then R+r=

    Text Solution

    |

  19. In Delta ABC, (cos((B-C)/2))/(cos (A/2))=

    Text Solution

    |

  20. In DeltaABC, if sin A sin B=(ab)/(c^(2)), then the triangle is

    Text Solution

    |