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Prove that : 4\ R\ sin AsinB\ sin C=acos...

Prove that : `4\ R\ sin AsinB\ sin C=acosA+b\ cos B+c cosCdot`

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ALLEN-SOLUTION AND PROPERTIES OF TRIANGLE-All Questions
  1. If n=4\ then Bn is equal to : R^2((4-pi))/2 (b) (R^2(4-pisqrt(2)))/2 ...

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  2. (An)/(Bn) is equal to (theta=pi/n) (2theta-sin2theta)/(sin2theta-thet...

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  3. Prove that : 4\ R\ sin AsinB\ sin C=acosA+b\ cos B+c cosCdot

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  4. Prove that : acosB\ cos C+bcosCcosA+c\ cos AcosB=/R

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  5. If p1, p2, p3, be the altitudes of a triangle ABC from the vertices A,...

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  6. Prove that : (a b c)/scosA/2cosB/2cosC/2=

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  7. In a DeltaABC, if B=3C, prove that (i) cosC=sqrt(((b+c)/(4c)))" (i...

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  8. A B C is a triangle. D is the mid point of B Cdot If A D is perpendicu...

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  9. Let 1 lt m lt 3. ln a Delta ABC, if 2b= (m+1) a and cos A=1/2 sqrt(((m...

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  10. Prove that : 1/(r1)+1/(r2)+1/(r3)=1/r

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  11. Prove that r1+r2+r3-r=4R

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  12. If r(1), r(2) ,r(3) are the ex-radii of DeltaABC, then prove that (b...

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  13. Consider a D E F , the pedal triangle of the A B C such that A-F-B\ ...

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  14. D E F is the triangle formed by joining the points of contact of the i...

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  15. If sides a , b , c of the triangle A B C are in AdotPdot , then prove ...

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  16. sin6x=sin4x−sin2x then Find the value of x.

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  17. In a Delta ABC, GA,GB,GC makes angles alpha, beta, gamma with each oth...

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  18. about to only mathematics

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  19. If A,A1,A2 and A3 be respectively the areas of the inscribed and escri...

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  20. The value of 1+cot ^2A is

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