Home
Class 11
MATHS
If sin.alpha/2+cos.alpha/2=1.4, then: si...

If `sin.alpha/2+cos.alpha/2=1.4,` then: `sinalpha=`

A

`50/47`

B

`47/50`

C

`24/25`

D

`25/24`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES AND FACTORIZATION FORMULAE

    MARVEL PUBLICATION|Exercise MCQs|101 Videos

  • TRIGONOMETRIC FUNCTIONS

    MARVEL PUBLICATION|Exercise MCQs|175 Videos

Similar Questions

Explore conceptually related problems

If sin alpha/2 + cos alpha/2=1.4 , then: sin alpha cos alpha =

If : sin(alpha//2)cos(alpha//2)=12/25. then: sinalpha=

If alpha in Q_(4) and (sin alpha)/(2)+(cos alpha)/(2)=-(1)/(2) then sin2 alpha=

If (2 sin alpha)/(1 + cos alpha + sin alpha) = 3/4 , then the value of (1 + cos alpha + sinalpha)/(1 + sin alpha) is equal to

If (sin^(2)alpha-3 sinalpha+2)/(cos^(2)alpha)=1 , then alpha can be ___________.

If sinalpha+cosalpha=p , then what is cos^(2)(2alpha) equal to ?

If (2sin alpha) / ({1 + cos alpha + sin alpha}) = y, then ({1-cos alpha + sin alpha}) / (1 + sin alpha) =

If sinalpha+cosalpha=(1)/(5), find tan((alpha)/(2)).

If cos^(2)alpha+ cos alpha=1 , then find the value of 4 sin^(2)alpha+4 sin^(4) alpha+2 .

If alpha in Q_(4) and sin((alpha)/(2))+cos((alpha)/(2))=-(1)/(2) then sin2 alpha=

MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES AND FACTORIZATION FORMULAE-MCQs
  1. If, in a DeltaABC,tanA=1andtanB=2, then: tanC= (a) 1 (b) 2 (c) 3 (d) 4

    Text Solution

    |

  2. If, in a DeltaABC,tanA=1andtanB=2, then: tanC=

    Text Solution

    |

  3. The value of sin^2 75^0-sin^2 15^0 is 1//2 b. sqrt(3)//2 c. 1 d. 0

    Text Solution

    |

  4. If DeltaABC is a right-angled at A, then: cos^2B+cos^2C=

    Text Solution

    |

  5. sin^6A+cos^6A+3sin^2A.cos^2A=

    Text Solution

    |

  6. If cos(A-B)=3/5and tan A tanB=2, then

    Text Solution

    |

  7. If A, B, C, D be the angles of acyclic quadrilateral, show that : cosA...

    Text Solution

    |

  8. If sin.alpha/2+cos.alpha/2=1.4, then: sinalpha=

    Text Solution

    |

  9. If tanalpha+cotalpha=m then value of tan^4alpha+cot^4alpha is

    Text Solution

    |

  10. If cos theta+cos phi=a and sin theta - sin phi=b, then: 2cos(theta + p...

    Text Solution

    |

  11. If sinx+cosecx=2, then, for all n in N, the value of: sin^nx+cosec^nx=...

    Text Solution

    |

  12. If sinA+sinB+sinC=(3sqrt3)/(2). then: DeltaABC is (a) isosceles (b) ri...

    Text Solution

    |

  13. In triangle ABC, cos^2A + cos^2B - cos^2C = 1, then the triangle is ne...

    Text Solution

    |

  14. If tanx=b//a, then: acos2x+bsin2x=

    Text Solution

    |

  15. (sin^(2)3A)/(sin^2A)-(cos^(2)3A)/(cos^2A)=

    Text Solution

    |

  16. If t a ntheta1t a ntheta2=k , then ("cos"(theta1-theta2))/("cos"(theta...

    Text Solution

    |

  17. tan 5x.tan3x.tan2x=

    Text Solution

    |

  18. If a+btantheta=secthetaandb-atantheta=2sectheta, then: a^2+b^2=

    Text Solution

    |

  19. If cos25^0+sin25^0=p , then cos50^0 is sqrt(2-p^2) (b) -sqrt(2-p^2) ...

    Text Solution

    |

  20. If tan(x+y)=33 and x= tan^(-1) 3 then y will be

    Text Solution

    |