Home
Class 11
MATHS
Prove that (2cos2A+1)/(2cos2A-1)=tan(60^...

Prove that `(2cos2A+1)/(2cos2A-1)=tan(60^0+A)tan(60^0-A)dot`

Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRY

    MODERN PUBLICATION|Exercise NCERT EXAMPLES|6 Videos

  • TRIGONOMETRY

    MODERN PUBLICATION|Exercise Exercise 3(a) Short Answer type Question|13 Videos

  • TRIGONOMETRY

    MODERN PUBLICATION|Exercise Chapter Test (3)|12 Videos

  • STRAIGHT LINES

    MODERN PUBLICATION|Exercise Chapter test|12 Videos

Similar Questions

Explore conceptually related problems

Prove that (2cos2A+1)/(2cos2A-1)=tan(60^(@)+A)tan(60^(@)-A)

prove that (1-cos2A)/(1+cos2A)=tan^(2)A

Prove that (sin2A)/(1+cos2A)=tan A

Prove that (tan^(2)A-1)/(tan^(4)A-1)=cos^(2)A

Prove that: (i) cos A cos(60^(@)-A)cos (60^(@)+A)=(1)/(4)cos 3A (ii) "tan" A+"tan"(60^(@)+A)-"tan"(60^(@)-A)=3 tan 3A .

Prove that sqrt((1-cos2 theta)/(1+cos2 theta))=tan theta where tan theta>0

Prove that sqrt((1-cos2 theta)/(1+cos2 theta))=tan theta where tan theta>0

Prove that 2tan^(-1)(cos e ctan^(-1)x-tancot^(-1)x)=tan^(-1)x(x!=0)dot

Prove that: tan(pi/3-A).tan(pi/3+A)= (2cos2A+1)/(2cos2A-1)

Prove that (1-tan^(2)A)/(1+tan^(2)A)=2cos^(2)A-1

MODERN PUBLICATION-TRIGONOMETRY-FREQUENTLY ASKED QUESTIONS
  1. Prove that 5costheta+3cos(theta+pi/3)+3 lies between -4a n d10.

    Text Solution

    |

  2. Prove that: cos 2theta"cos"(theta)/(2)-cos 3theta cos((9theta)/2)="...

    Text Solution

    |

  3. Prove that (2cos2A+1)/(2cos2A-1)=tan(60^0+A)tan(60^0-A)dot

    Text Solution

    |

  4. " sin " (150^(@) + x) + " sin " (150^(@) -x) " = cos x"

    Text Solution

    |

  5. If the angles A,B,C are in A.P., prove that cot B=("sin" A-"sin" C)/(c...

    Text Solution

    |

  6. (cosalpha+cosbeta)^2+(sinalpha-sinbeta)^2=4cos^2(alpha+beta)/2

    Text Solution

    |

  7. If "sin" theta+"sin" phi=sqrt3(cos phi-cos theta),prove that: "sin"...

    Text Solution

    |

  8. prove that ((cosA+cosB)/(sinA-sinB))^n+((sinA+sinB)/(cosA-cosB))^n=2co...

    Text Solution

    |

  9. If sin x+"sin" y=a and cos x+cos y=b, find the values of: (i) "tan...

    Text Solution

    |

  10. Prove that sin 10^(@) " sin " 50^(@) " sin " 60^(@) " sin " 70^(@) ...

    Text Solution

    |

  11. (sin 5x + sin 3x)/(cos 5x + cos 3x) = tan 4x

    Text Solution

    |

  12. Prove that n( " cos " 4x + " cos " 3x + " cos " 2x)/(" sin " 4x +...

    Text Solution

    |

  13. (( sin 7x + sin 5x)+(sin 9x + sin 3x))/((cos 7x + cos 5x)+(cos 9x+ cos...

    Text Solution

    |

  14. Prove that cosalpha+cosbeta+cosgamma+cos(alpha+beta+gamma)=4cos((alpha...

    Text Solution

    |

  15. If s intheta=n"sin"(theta+2alpha) , prove that tan(theta+alpha)=(1+n)/...

    Text Solution

    |

  16. If alpha+beta+90^0 , find the maximum and minimum values of s inalphas...

    Text Solution

    |

  17. Prove that (tan 5theta + tan 3theta)/(tan 5theta - tan 3theta) = 4 c...

    Text Solution

    |

  18. Find "sin" 2theta when "sin" theta+cos theta=1.

    Text Solution

    |

  19. Prove that: "tan"A+cotA=2"cosec" 2A and deduce that "tan" 75^(@)+co...

    Text Solution

    |

  20. Prove that (i) (sec 8A -1)/(sec 4A -1) =(tan 8A)/(tan 2A) (ii) (c...

    Text Solution

    |