Home
Class 12
MATHS
If cos theta cos 2 theta cos 3theta = 1/...

If `cos theta cos 2 theta cos 3theta = 1//4` for `0 lt theta lt pi` then `theta =`

A

`(pi)/(7), (5pi)/(7), pi`

B

`(pi)/(2), (pi)/(4), (3pi)/(4), (pi)/(6), (5pi)/(6)`

C

`(pi)/(8), (3pi)/(8), (5pi)/(8), (7pi)/(8), (pi)/(3), (2pi)/(3)`

D

`(2n pi)/(3) : n in Z` or `n pi + (pi)/(4) : n in Z`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRIC EQUATIONS

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 (SPECIAL TYPE QUESTIONS) SET - 1|4 Videos

  • TRIGONOMETRIC EQUATIONS

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 (SPECIAL TYPE QUESTIONS) SET - 2|4 Videos

  • TRIGONOMETRIC EQUATIONS

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 (SPECIAL TYPE QUESTIONS) SET - 4|4 Videos

  • TRANSFORMATION OF AXES

    DIPTI PUBLICATION ( AP EAMET)|Exercise SET-4|3 Videos

  • TRIGONOMETRIC RATIOS AND IDENTITIES

    DIPTI PUBLICATION ( AP EAMET)|Exercise EXERCISE 2 ( SPEICAL TYPE QUESTIONS ) SET -4|20 Videos

Similar Questions

Explore conceptually related problems

If cos 6theta + cos 4theta + cos 2theta +1 =0 for 0 le theta le pi then theta =

If cos theta + cos 2theta + cos 3theta = 0 then theta =

If cos theta + cos 7 theta + cos 3 theta + cos 5 theta = 0 " then " theta =

If cos theta = cos 5pi//4 , then theta =

If cos theta - sin theta=1/5 , where 0 lt theta lt pi/4 , then:

cos theta + cos 2 theta + cos 3 theta + …. + cos { (n-1) theta}+ cos n theta=

Solve sin theta + sin 5 theta = sin 3 theta , 0 lt theta lt pi .

1+ cos 2 theta + cos 4 theta + cos 6 theta =

DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC EQUATIONS -EXERCISE 1
  1. If cos 6theta + cos 4theta + cos 2theta +1 =0 for 0 le theta le pi the...

    Text Solution

    |

  2. If sec x cos 5x + 1 =0, 0 lt x lt 2pi, then x =

    Text Solution

    |

  3. If cos theta cos 2 theta cos 3theta = 1//4 for 0 lt theta lt pi then t...

    Text Solution

    |

  4. If 4 sin x.sin 2x.sin 4x = sin 3x then theta =

    Text Solution

    |

  5. If 4 cos theta.cos(120^(@)+theta).cos(120^(@)-theta)=1//2 then theta =

    Text Solution

    |

  6. The sum of the solutions in (0, 2pi) of the equation cos x cos ((pi)/(...

    Text Solution

    |

  7. If sin theta.sin (60+theta)sin (60-theta)=1//4 then theta =

    Text Solution

    |

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

    Text Solution

    |

  9. If tan theta + tan(60^(@)+theta)+tan (120^(@)+theta)=3, then theta =

    Text Solution

    |

  10. If tan theta + tan 2theta + tan 3theta = 0 then theta =

    Text Solution

    |

  11. If tan theta + tan 2theta = tan 3theta, then theta =

    Text Solution

    |

  12. If tan theta + tan (pi//3+theta)-tan(pi//3-theta)=3 then theta =

    Text Solution

    |

  13. The solution of sin 2 theta + cos 2theta + sin theta + cos theta + 1 =...

    Text Solution

    |

  14. If cos 3x + cos 2x = sin (3x//2)+sin(x//2), 0 le x le 2pi, then x =

    Text Solution

    |

  15. The solution set of sin 2theta - cos 2theta - sin theta + cos theta = ...

    Text Solution

    |

  16. If sin x - 3 sin 2x + sin 3x = cos x - 3 cos 2x + cos 3x then x =

    Text Solution

    |

  17. If sin[(pi)/(4)cot theta]=cos[(pi)/(4)tan theta] then theta =

    Text Solution

    |

  18. If tan((pi)/(2) sin theta)=cot((pi)/(2)cos theta) then sin(theta +(pi)...

    Text Solution

    |

  19. If tan(picostheta)=cot(pisintheta), then prove that cos(theta-(pi)/(4...

    Text Solution

    |

  20. If tan(cot x) = cot (tan x), then sin 2x =

    Text Solution

    |