Home
Class 12
MATHS
sin36^@sin72^@sin108^@sin144^@=5/16...

`sin36^@sin72^@sin108^@sin144^@=5/16`

A

5

B

4

C

3

D

1

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRIC RATIOS AND IDENTITIES

    OBJECTIVE RD SHARMA|Exercise Chapter Test|60 Videos

  • TRIGONOMETRIC RATIOS AND IDENTITIES

    OBJECTIVE RD SHARMA|Exercise Section II - Assertion Reason Type|13 Videos

  • TRIGONOMETRIC EQUATIONS AND INEQUATIONS

    OBJECTIVE RD SHARMA|Exercise Chapter Test|60 Videos

Similar Questions

Explore conceptually related problems

Prove that: sin36^(@)s in72^(0)s in108^(0)s in144^(0)=(5)/(16)

Prove that: "sin"(pi)/(5)"sin"(2pi)/(5)"sin"(3pi)/(5)"sin"(4pi)/(5)=(5)/(16) "sin"36^(@) "sin"72^(@) "sin"108^(@) sin 144^(@)=(5)/(16) .

Prove that: sin6^(@)sin42^(@)sin66^(@)sin78^(@)=1/16

sin 36^(º)sin 72^(º) sin108^(º) sin 144^(º) =

Prove that (1)cos36^(@)cos72^(@)cos108^(@)cos144^(@)=(1)/(16)(2) Show that 4sin27^(@)=sqrt(5+sqrt(5))-sqrt(3-sqrt(5))

Prove that: cos36^(@)cos72^(@)cos108^(@)cos144^(@)=(1)/(16)

The value of (sin28^(@)+sin32^(@)-sin60^(@))/(sin14^(@)sin16^(@)sin30^(@))

OBJECTIVE RD SHARMA-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
  1. The interior angles of a polygon are in AP The smallest angle is 120 a...

    Text Solution

    |

  2. The maximum and minimum values of -4le5cos theta+3cos(theta+(pi)/(3...

    Text Solution

    |

  3. sin36^@sin72^@sin108^@sin144^@=5/16

    Text Solution

    |

  4. If A=tan6^0tan42^0 and B=cot66^0cot78^0 , then

    Text Solution

    |

  5. If sinx+cosesx=2,thensin^(n)x+cosec^(n)x is equal to

    Text Solution

    |

  6. If x/acosalpha+y/bsinalpha=1, x/acosbeta+y/bsinbeta=1 and (cos alpha c...

    Text Solution

    |

  7. The value of theta lying between 0 and pi/2 and satisfying |[1+sin^2th...

    Text Solution

    |

  8. The value of sqrt3cot20^(@)-4cos20^(@) is

    Text Solution

    |

  9. sqrt(3)cossec2 0^0-sec2 0^0

    Text Solution

    |

  10. The equation sin^2theta=(x^2+y^2)/(2x y),x , y!=0 is possible if

    Text Solution

    |

  11. The value of sin(pi+theta)sin(pi-theta)cosec^(2)theta is equal to

    Text Solution

    |

  12. If (sin(x+y))/(sin(x-y))=(a+b)/(a-b) , then show that (tanx)/(tany)=(...

    Text Solution

    |

  13. if sin x + sin^2 x = 1, then the value of cos^2 x + cos^4x is

    Text Solution

    |

  14. If tan(x/2)=cosec x - sin x then the value of tan^2(x/2) is

    Text Solution

    |

  15. If cosA=3/4, then 32 sin, A/2 sin, (5A)/2= (A) sqrt(11) (B) -sqrt(11) ...

    Text Solution

    |

  16. (1+cos.(pi)/(8))(1+cos.(3pi)/(8))(1+cos.(5pi)/(8))(1+cos.(7pi)/(8)) is...

    Text Solution

    |

  17. If t a n^2theta=2t a n^2varphi+1 , prove that cos2theta+s in^2varphi=0...

    Text Solution

    |

  18. If sin2theta=cos3theta where theta in (0,pi/2) , then sintheta is equa...

    Text Solution

    |

  19. if y=cos^2theta+sec^2theta then

    Text Solution

    |

  20. The value of sinpi/(14)sin(3pi)/(14)sin(5pi)/(14)sin(7pi)/(14)sin(9pi)...

    Text Solution

    |