Home
Class 12
MATHS
If cos (theta-phi)=(2)/(5) and tan theta...

If `cos (theta-phi)=(2)/(5)` and `tan theta tan phi=3, ` then `cos theta cos phi` is equal to _______

Text Solution

Verified by Experts

The correct Answer is:
0.1
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRICAL IDENTITIES AND EQUATIONS

    MCGROW HILL PUBLICATION|Exercise EXERCISE (Concept-based Single Correct Answer Type Questions ) |20 Videos

  • TRIGONOMETRICAL IDENTITIES AND EQUATIONS

    MCGROW HILL PUBLICATION|Exercise EXERCISE (LEVEL 1 Single Correct Answer Type Questions)|53 Videos

  • TRIGONOMETRICAL IDENTITIES AND EQUATIONS

    MCGROW HILL PUBLICATION|Exercise SOLVED EXAMPLES (LEVEL 2 Single Correct Answer Type Questions) |32 Videos

  • THE DIMENSIONAL GEOMETRY

    MCGROW HILL PUBLICATION|Exercise QUESTIONS FROM PREVIOUS YEARS. B-ARCHITECTURE ENTRANCE EXAMINATION PAPERS|25 Videos

  • VECTOR ALGEBRA

    MCGROW HILL PUBLICATION|Exercise QUESTIONS FROM PREVIOUS YEARS. B-ARCHITECTURE ENTRANCE EXAMINATION PAPERS|20 Videos

Similar Questions

Explore conceptually related problems

If tan^(2)theta=2tan^(2)phi+1, then cos2 theta+sin^(2)phi is equal to

If cos theta+cos phi=a and sin theta - sin phi=b , then: 2cos(theta + phi) =

If 3 tan theta tan phi=1, then (cos (theta-phi))/(cos (theta+phi)) is

If 3tan theta tan phi=1 then (cos(theta-phi))/(cos(theta+phi)) is

If (1+tan theta)(1+tan phi)=2 then theta+phi=

If (1+tan theta)(1+tan phi)=2then(theta+phi) is

If sin2 theta+sin2 phi=(1)/(2) and cos2 theta+cos2 phi=(3)/(2), then cos^(2)(theta-phi)=

If sin(theta+phi)=n sin(theta-phi), then the value of (tan theta)/(tan phi) is equal to

If tan theta=(5)/(6) and tan phi=(1)/(11) , then theta+phi =______

MCGROW HILL PUBLICATION-TRIGONOMETRICAL IDENTITIES AND EQUATIONS -SOLVED EXAMPLES (Numerical Answer Type Questions)
  1. If cos (theta-phi)=(2)/(5) and tan theta tan phi=3, then cos theta co...

    Text Solution

    |

  2. (1)/(2 tan 64^(@)) ((cos19^(@)+sin 19^(@))/(cos19^(@)-sin 19^(@))) is ...

    Text Solution

    |

  3. If alpha gt 0, beta gt 0, and alpha+beta=pi//3, then maximum value of ...

    Text Solution

    |

  4. (1)/(cos80^(@))-(sqrt(3))/(sin80^(@)) is equal to

    Text Solution

    |

  5. If 0 lt theta lt pi//4 and tan theta=4//5, then tan 2theta+sec 2 theta...

    Text Solution

    |

  6. If cos theta=(1)/(2)(a+(1)/(a)), where a gt 0, then 3cos(3theta) is eq...

    Text Solution

    |

  7. If cot((2)/(3) theta)+tan ((1)/(3) theta)="cosec"((k)/(6) theta) the v...

    Text Solution

    |

  8. If 0 lt theta lt pi//2 and sec theta=5//4 then value of (3)/(2) tan ((...

    Text Solution

    |

  9. If 0 lt alpha lt pi//16, then ((tan alpha+2tan(2alpha)+4tan(4alpha)+...

    Text Solution

    |

  10. If theta=pi//9, then log(2)(cos theta)+log(2)(cos 2theta)+log(2)(cos 4...

    Text Solution

    |

  11. sum(k=0)^(11) sec((pi)/(4)+(k pi)/(3)) sec((pi)/(4)+((k+1)pi)/(3)) is ...

    Text Solution

    |

  12. Let alpha= 3pi sum(n=1)^(oo)(1)/(n(n+1)(n+2)(n+3)). Then sqrt(3)[cos a...

    Text Solution

    |

  13. If 0 lt theta lt (pi)/(6), k gt 1 and (tan 3 theta)/(tan theta)=k, the...

    Text Solution

    |

  14. If a in R, then cos^(2) alpha+cos^(2)(alpha+2pi//3)+cos^(2)(alpha-...

    Text Solution

    |

  15. Let alpha=36^(@) and a=sin alpha sin(2alpha) sin(3alpha) sin (4alpha) ...

    Text Solution

    |

  16. Let alpha=pi//8 and a=cos^(8)alpha+cos^(8)(3alpha)+cos^(8)(5alpha)+cos...

    Text Solution

    |

  17. If alpha=pi//11, then cos alpha+cos(3alpha)+cos(5alpha)+cos(7alpha)+...

    Text Solution

    |

  18. "cosec"((pi)/(14))-4cos((2pi)/(7))=

    Text Solution

    |

  19. For theta=pi//7, let P=prod(k=1)^(3)(1-tan^(2)(k theta//2))/(1+tan...

    Text Solution

    |

  20. Let alpha=pi//16, and let S=sin^(4)alpha+sin^(4)(3alpha)+sin^(4)(5a...

    Text Solution

    |