Home
Class 11
MATHS
Prove that (i) " 2sin " (5pi)/(12) "...

Prove that
`(i) " 2sin " (5pi)/(12) " sin " (pi)/(12)=(1)/(2)`
`(ii) " 2 cos " (5pi)/(12) " cos " .(pi)/(12)=(1)/(2)`
`(iii) " 2 sin ".(5pi)/(12) " cos " (pi)/(2) = ((2+sqrt(3))/(2))`

Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRIC , OR CIRCULAR, FUNCTIONS

    RS AGGARWAL|Exercise Exercise (15C)|27 Videos
  • TRIGONOMETRIC , OR CIRCULAR, FUNCTIONS

    RS AGGARWAL|Exercise Exercise (15D)|21 Videos
  • TRIGONOMETRIC , OR CIRCULAR, FUNCTIONS

    RS AGGARWAL|Exercise Exercise (15A)|10 Videos
  • THREE-DIMENSIONAL GEOMETRY

    RS AGGARWAL|Exercise EXERCISE 26 C|13 Videos
  • TRIGONOMETRIC EQUATIONS

    RS AGGARWAL|Exercise EXERCISE|21 Videos

Similar Questions

Explore conceptually related problems

Evaluate : (i) " sin " (pi)/(2) " "(ii) " sin " (5pi)/(12)

Prove that (i) "sin " (7pi)/(12) " cos " (pi)/(2) - "cos " *(7pi)/(12) " sin " (pi)/(4) = (sqrt(3))/(2) (ii) " sin " (pi)/(4) " cos " (pi)/(2) + "cos"(pi)/(4) " sin " (pi)/(12) = (sqrt(3))/(2) (iii) " cos " (2pi)/(3) " cos " (pi)/(4) - " sin " (2pi)/(3) " sin " (pi)/(4) =(-(sqrt(3) +1))/(2sqrt(2))

Prove that; 2(sin(5 pi))/(12)(sin pi)/(12)=(1)/(2)

Prove that 2sin((5 pi)/(12))cos((pi)/(12))=(2+sqrt(3))/(2)

Prove that (i) " sin " .(pi)/(6). " cos " .(pi)/(6) = (sqrt(3))/(4) " " (iii) cos^(2) .(pi)/(2) - sin^(2) .(pi)/(2) =(sqrt(3))/(2)

2sin((5 pi)/(12))(sin((pi)/(12)))=

(cos pi) / (12) - (sin pi) / (12) = (1) / (sqrt (2))

Prove that (i) " tan"^(2) .(pi)/(3) + 2cos^(2) .(pi)/(4)+ 3 sec^(2).(pi)/(6)+ 4 cos^(2).(pi)/(2)=8 (ii) " sin ".(pi)/(6) " cos 0 + sin ".(pi)/(4) " cos " .(pi)(4) + " sin " .(pi)/(3) "cos " .(pi)/(6) =(7)/(4) (iii) " 4sin " (pi)/(6) " sin"^(2) (pi)/(3) + 3 " cos " .(pi)/(3) " tan ".(pi)/(4) = " cosec"^(2).(pi)/(2)=4

(cos ((pi) / (12)) - sin ((pi) / (12))) (tan ((pi) / (12)) + cot ((pi) / (12))) =

(cos ((pi) / (12)) - sin ((pi) / (12))) ((tan pi) / (12) + (cot pi) / (12))

RS AGGARWAL-TRIGONOMETRIC , OR CIRCULAR, FUNCTIONS-Exercise (15B)
  1. Find the value of (i) cos 840 "(ii) sin 870

    Text Solution

    |

  2. Find the values of all trigonometric functions of 135^(@)

    Text Solution

    |

  3. Prove that (i) " sin " 80^(@) "cos " 20^(@) - " cos " 80^(@) ...

    Text Solution

    |

  4. Prove that (i) " sin " (50^(@) + theta ) " cos " (20^(@) + theta)...

    Text Solution

    |

  5. Prove that (i) cos (n + 2) x cos (n+1) x +sin (n+2) x sin...

    Text Solution

    |

  6. Prove that (tan(pi/4+x))/(tan(pi/4-x))=((1+t a n x)/(1-t a n x))^2

    Text Solution

    |

  7. Prove that (i) " sin " 75^(@) =((sqrt(6)+sqrt(2)))/(4)(ii) (cos 13...

    Text Solution

    |

  8. Prove that (i) "cos " 15^(@) - " sin " 15^(@) = (1)/(sqrt(2)) ...

    Text Solution

    |

  9. Prove that (cos 9^(@)+ sin 9^(@))/(cos 9^(@) -sin 9^(@)) = tan 54^...

    Text Solution

    |

  10. Prove that (cos 8^(@) - sin 8^(@))/(cos 8^(@) + sin 8^(@)) = tan 3...

    Text Solution

    |

  11. Prove that (cos(pi +theta)cos (-theta))/(cos(pi-theta) cos (pi/2+theta...

    Text Solution

    |

  12. (cos (pi + theta))/(sin(90^(@) +theta)) +(sin (-theta))/(sin(180^(@) +...

    Text Solution

    |

  13. Prove that: (s in(180^0+theta)cos(90^0+theta)t a n(270^0-theta)cot(360...

    Text Solution

    |

  14. If theta and phi lie in the first quadrant such that sin theta...

    Text Solution

    |

  15. If x and y are acute angles such that sin x =1/sqrt5 and sin y =1/sqrt...

    Text Solution

    |

  16. If x and y are acute angles such that cosx=13/14 and cosy=1/7 , prove...

    Text Solution

    |

  17. If sin x=(12)/(13) "and sin " y= (4)/(5) " where " (pi)/(2) lt ...

    Text Solution

    |

  18. if cos x=(3)/(5) " and cos " y=(-24)/(25) " where " .(3pi)/(2) lt...

    Text Solution

    |

  19. Prove that (i) "cos " ((pi)/(3) +x) =(1)/(2) ( " cos " x - sqrt...

    Text Solution

    |

  20. Prove that (i) " 2sin " (5pi)/(12) " sin " (pi)/(12)=(1)/(2) (i...

    Text Solution

    |