Home
Class 11
MATHS
cos 35^0+cos 85^0+cos 155^0 a. adot\ 0 ...

`cos 35^0+cos 85^0+cos 155^0` a. `adot\ 0` b. `1/(sqrt(2))` c. `1/(sqrt(3))` d. `cos 275^0`

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • THE STRAIGHT LINES

    RD SHARMA ENGLISH|Exercise All Questions|493 Videos

  • TRIGONOMETRIC EQUATIONS

    RD SHARMA ENGLISH|Exercise All Questions|120 Videos

Similar Questions

Explore conceptually related problems

Exact value of cos 20^0+2sin^2\ \ 55^0-sqrt(2)sin65^0\ is- a. 1 b. 1/(sqrt(2)) c. sqrt(2) d. zero

cos 40^0+cos 80^0+cos 160^0+cos 240^0= a. 0 b. 1 c. 1//2 d. -1//2

Show that sin 70^0 cos 10^0 - cos 70^0 sin 10^0 = sqrt(3)/2

The value of cos 52^0+cos 68^0+cos 172^0 is a. 0 b. 1 c. 2 d. 3//2

Let x=sin1^0, then the value of the expression. 1/(cos0^0dotcos1^0)+1/(cos1^0dotcos2^0)+1/(cos2^0dotcos3^0)+1/(cos44^0dotcos45^0) is equal to (a) x (b) 1/x (c) (sqrt(2))/x (d) x/(sqrt(2))

The value of expression (2(sin1^0+sin2^0+sin3^0+...+sin89^0))/(2(cos1^0+cos2^0++cos44^0)+1) (a) sqrt(2) (b) 1/(sqrt(2)) (c) 1/2 (d) 0

The values of cos^2 73^0+cos^2 47^0-sin^2 43^0+sin^2 107^0 is equal to: (b) 1/2 (c) (sqrt(3))/2 (d) sin^2 73^@+cos^4 73^@

Show that: sin 50^0cos85^0=(1-sqrt(2)sin35^0)/(2sqrt(2))

Show that: sin 50^0cos95^0=(sqrt(2)sin35^0-1)/(2sqrt(2))

If sin47^0+sin 61^0-sin 11^0-sin 25^0 is equal to a. adot\ sin36^0 b. cos36^0 c. cos7^0 d. cos7^0

RD SHARMA ENGLISH-TRANSFORMATION FORMULAE-All Questions
  1. If (cosalpha+cosbeta)^2+(sinalpha+sinbeta)^2=lambdacos^2((alpha-beta)/...

    Text Solution

    |

  2. If sin A+sin B=alpha\ a n d\ cos A+cos B=beta, then write the value of...

    Text Solution

    |

  3. If cos A=m cos B , then write the value of cot((A+B)/2)cot((A-B)/2dot)

    Text Solution

    |

  4. Write the value of the expression (1-4sin1 0^0sin7 0^0)/(2sin1 0^0)

    Text Solution

    |

  5. If A+B=pi/3a n dcosA+cos B=1, then find the value of cos((A-B)/2dot)

    Text Solution

    |

  6. Write the value of sin 12^0sin48^0sin54^0dot

    Text Solution

    |

  7. If sin2A=lambdasin2B , then write the value of (lambda+1)/(lambda-1) .

    Text Solution

    |

  8. Write the value of (sin A+sin3A)/(cos A+cos3A) .

    Text Solution

    |

  9. If cos(A+B)sin(C-D)="cos"(A-B)"sin"(C+D) , then write the value of t a...

    Text Solution

    |

  10. cos 40^0+cos 80^0+cos 160^0+cos 240^0= a. 0 b. 1 c. 1//2 d. -1//2

    Text Solution

    |

  11. sin 163^0cos 347^0+sin 73^0sin 167^0= a.1//2 b. 1 c. 0 d. none of the...

    Text Solution

    |

  12. If sin2theta+sin2varphi=1/2a n d\ cos2theta+cos2varphi=3/2 , then cos^...

    Text Solution

    |

  13. The value of cos 52^0+cos 68^0+cos 172^0 is a. 0 b. 1 c. 2 d. 3//2

    Text Solution

    |

  14. The value of sin 78^0-sin 66^0-sin 42^0+sin6^0 is a. -1 b. 1//2 c. -1/...

    Text Solution

    |

  15. If sinalpha+sinbeta=a\ and\ cosalpha-cosbeta=b , then tan((alpha-beta)...

    Text Solution

    |

  16. cos 35^0+cos 85^0+cos 155^0 a. adot\ 0 b. 1/(sqrt(2)) c. 1/(sqrt(3)) ...

    Text Solution

    |

  17. The value of sin 50^(0)-sin 70^0+sin 10^0 is equal to a. 0 b. 1 c. 2 d...

    Text Solution

    |

  18. If sin47^0+sin 61^0-sin 11^0-sin 25^0 is equal to a. adot\ sin36^0 b. ...

    Text Solution

    |

  19. If cos A=mcosB ,\ t h e ncot((A+B)/2)cot((B-A)/2) adot\ (m-1)/(m+1) b...

    Text Solution

    |

  20. If A ,\ B ,\ C are in A.P. then (sin A-sin C)/(cos C-cos A)= adot\ t ...

    Text Solution

    |