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In a A B C , if a=3,b=5a n dc=7,fin dco...

In a ` A B C` , if `a=3,b=5a n dc=7,fin dcos A ,cos Ba n dcos Cdot`

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RD SHARMA ENGLISH-SINE AND COSINE FORMULAE AND THEIR APPLICATIONS-All Questions
  1. The angles of a triangle A B C are in AdotPdot and it is being given t...

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  2. In A B C , prove that (a-b^2cos^2C/2+(a+b)^2sin^2C/2=c^2dot

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  3. In a A B C , if a=3,b=5a n dc=7,fin dcos A ,cos Ba n dcos Cdot

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  4. A particle just clears a wall of height b at distance a and strikes...

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  5. A person observes the angle of elevation of the peak of a hill from a ...

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  6. If in a triangleA B C , (2cosA)/a+(cos B)/b+(2cosC)/c=a/(b c)+b/(c a) ...

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  7. In a triangle A B C , if cos A=(sinB)/(2sinC) , show that the triangle...

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  8. In any Delta A B C , prove that: (cosA)/(bcosC+c cosB)+(cosB)/(c cos...

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  9. In any DeltaA B C ,suma(sinB-sin C)= (a) a^2+b^2+c^2 (b) a^2 (c) b...

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  10. In a Delta A B C , ifsinAa n dsinB are the roots of the equation c^2...

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  11. In any A B C , prove that: Delta=(a^2-b^2)/2dot(sinAsinB)/(sin(A-B))

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  12. In any triangle A B C , prove that:Delta=(b^2+c^2-a^2)/(4cotA) .

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  13. In a triangle A B C ,a=4,b=3,/A=60^0 then c is root of the equation c^...

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  14. In any A B C ,2(bc cosA+ ca cosB+ab cosC) =

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  15. In any A B C , the value of 2a csin((A-B+C)/2) is (a)a^2+b^2-c^2 ...

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  16. In a A B C , if (c+a+b)(a+b-c)=a b , then the measure of angel C is p...

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  17. If any triangle A B C , that: (b^2-c^2)/(cosB+cosC)+(c^2-a^2)/(cosC+co...

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  18. In a right angled triangle ABC, write the value of sin^2 A + sin^2 B+ ...

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  19. Prove that, (asin(B-C))/(b^(2)-c^(2)) = (bsin(C-A))/(c^(2)-a^(2)) = ...

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  20. In a A B C , if cosC=(sinA)/(2sinB) , prove that the triangle is isos...

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