Home
Class 11
MATHS
Find sin 7 1^@/2, cos 7 1^@/2 and tan 11...

Find `sin 7 1^@/2, cos 7 1^@/2` and `tan 11 1^@/4`.

Promotional Banner

Topper's Solved these Questions

  • TRIGNOMETRY

    MODERN PUBLICATION|Exercise EXERCISE|730 Videos

  • STRAIGHT LINES

    MODERN PUBLICATION|Exercise EXERCISE|304 Videos

Similar Questions

Explore conceptually related problems

The value of cos 15^@ cos 7 1^@/2 sin 7 1^@/2 is:

Prove that cot 7 1^@/2 = (1+cos15^@)/(sin 15^@) .

Prove the following : (sin11 A sin A +sin 7A sin 3A)/ (cos11A sin A + cos 7A sin3A)= tan 8A .

Evaluate :- sin^2 30^@ cos^2 45^@+4tan^2 30^@+1/2sin^2 90^@+1/8cot^2 90^@ .

Prove that sin^2(pi/4) + cos^2(pi/6) - tan^2(pi/4) = 1/4

If 7 sin A = 24 cos A and 0ltAlt pi/2 , find 14 tan A - 25 cos A-7 sec A .

If x = tan^(-1) 1 - cos^(-1) ( - 1/2) + sin^(-1) 1/2 , y = cos (1/2 cos^(-1) (1/8)) , then

Evaluate the following : sin ^(2) ( cos ^(-1) . 1/2) + cos^(2) ( sin^(-1)√3/2 . ) .

Find the value of : 4 (2 tan^-1(1/3) + tan^-1(1/7))

MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
  1. Prove that : sin^2 6x-sin^2 4x= sin 2x sin 10x.

    Text Solution

    |

  2. Prove the following: cos^2 2x - cos^2 6x = sin 4x sin 8x

    Text Solution

    |

  3. Find sin 7 1^@/2, cos 7 1^@/2 and tan 11 1^@/4.

    Text Solution

    |

  4. Prove that : tan 142 1^@/2 =2+sqrt2-sqrt3-sqrt6.

    Text Solution

    |

  5. If theta be any real, prove that : cos4 theta=1-8 sin^2 theta cos^2 t...

    Text Solution

    |

  6. If theta be any real, prove that : sin5 theta= 5sin theta-20 sin^3 the...

    Text Solution

    |

  7. Prove the following: cot x cot 2x -cot 2x cot 3x -cot 3x cot x = 1

    Text Solution

    |

  8. Prove that: sin 3x + sin 2x -sin x = 4sin x cosfrac(x)(2)cosfrac(3x)(2...

    Text Solution

    |

  9. Prove that: (sin 3x + sin x) sin x + (cos 3x -cos x) cos x = 0

    Text Solution

    |

  10. Prove that cos^2 x + cos^2 (x+ pi/3) + cos^2(x- pi/3) =3/2.

    Text Solution

    |

  11. If cos theta = (cos phi-e)/(1-e cos phi), show that : tan frac (theta)...

    Text Solution

    |

  12. Prove that : sin 36^@ sin 72^@ sin 108^@ sin 144^@ =5/16.

    Text Solution

    |

  13. Prove that sin frac (pi)(10)+ sin frac (13 pi)(10)=-1/2.

    Text Solution

    |

  14. Prove that : sin^2 18^@ +cos^2 36^@= 3/4.

    Text Solution

    |

  15. Prove that : sin^2 24^@ -sin^2 6^@= 1/8 (sqrt5-1).

    Text Solution

    |

  16. Prove that sin 18^@ and cos 36^@ are the roots of the equation : 4x^2-...

    Text Solution

    |

  17. Prove that : sin 12^@ sin48^@ sin 54^@=1/8.

    Text Solution

    |

  18. Prove that : sin 6^@ sin 42^@ sin 66^@ sin 78^@ =1/16.

    Text Solution

    |

  19. Prove that cos 6^(@) cos 42^(@) cos 60^(@) cos 78^(@)=1/16 .

    Text Solution

    |

  20. Prove that : 16 cos frac (2pi)(15) cos frac (4pi)(15) cos frac (8pi)(1...

    Text Solution

    |