Home
Class 11
MATHS
Prove that acosA+bcosB+ccosC=2asinBsinC...

Prove that acosA+bcosB+ccosC=2asinBsinC.

Promotional Banner

Topper's Solved these Questions

  • SETS AND RELATIONS

    PATHFINDER|Exercise QUESTION BANK|56 Videos

  • STATISTICS

    PATHFINDER|Exercise QUESTION BANK|45 Videos

Similar Questions

Explore conceptually related problems

For any triangle ABC prove that acosA+bcosB +c cosC=2a sinBsinC

Prove that acosA+bcosB+ccosClt=sdot

Prove that a(bcosC-c cosB)=b^2-c^2

Prove that, (1+cosA+cos2A)/(sin A+sin2A)=cotA

Prove that ,In /_\ABC a(bcosC-ccosB)= b^2-c^2

Prove that b^(2) cos 2 A - a^(2) cos 2B = b^(2) -a^(2)

Prove that, log_(2)2=1

If a,b, c are in GP, Prove that a^2, b^2 , c^2 are in GP.

Prove that log_5^7 < sqrt2 .

Prove that cos 60^(@)=cos^(2)30^(@)-sin^(2)30^(@) .

PATHFINDER-SOLUTION OF TRIANGLE AND HEIGHT AND DISTANCE-QUESTION BANK
  1. Prove that asin(B-C)+bsin(C-A)+csin(A-B)=0.

    Text Solution

    |

  2. Prove that 1-tan(A/2)tan(B/2)=(2c)/(a+b+c).

    Text Solution

    |

  3. Prove that acosA+bcosB+ccosC=2asinBsinC.

    Text Solution

    |

  4. prove that cosA +cosB+cosC=1+r/R.

    Text Solution

    |

  5. The sides of a triangle are x^2+3x+3,2x+3,x^2+2x. Find the greatest a...

    Text Solution

    |

  6. If P1,P2,P3 be the altitudes of a triangle from the vertices A,B,C Res...

    Text Solution

    |

  7. If in triangleABC ,a^4+b^4+c^4=2c^2(a^2+b^2) then find angleC

    Text Solution

    |

  8. Let h1,h2,h3 be the altitudes of the DeltaABC and let the inradius be ...

    Text Solution

    |

  9. For any triangle ABC, find the value of (bc cos^2(A/2)+cacos^2(B/2)+a...

    Text Solution

    |

  10. If in a DeltaABC, sin^3A+sin^3B+sin^3C=3sinA.sinB.sinC,then find the v...

    Text Solution

    |

  11. AD is a median of the DeltaABC.If AE and AFare medians of the triangle...

    Text Solution

    |

  12. In a triangle DeltaXYZ, let a,b and c be the lengths of the sides opp...

    Text Solution

    |

  13. In a triangle DeltaXYZ, let a, b, and c be the length of the sides opp...

    Text Solution

    |

  14. If the angles of elevation of the top of a water from three collinear ...

    Text Solution

    |

  15. If in a triangle DeltaABC,a^2cos^2A-b^2-c^2=0, then

    Text Solution

    |

  16. In a triangle ABC,angleC=90^@, r and R are the inradius and circumra...

    Text Solution

    |

  17. A bird is sitting on the top of a vertical pole 20 m high and its elev...

    Text Solution

    |

  18. In a DeltaABC, tanA and tanB are the roots of pq(x^2+1)=r^2x. Then Del...

    Text Solution

    |

  19. In a DeltaABC, a,b,c are the sides of the triangle opposite to the ang...

    Text Solution

    |

  20. Let PQR be a triangle of area Delta with a=2,b=7/2 and c=5/2, where a,...

    Text Solution

    |