In a triangle `A B C ,(r_1+r_2)/(1+cosC)` is equal to `(2a b)/(c"Delta")` (b) `((a+b))/(c"Delta")` `(a b c)/(2"Delta")` (d) `(a b c)/("Delta"^2)`

In a triangle ABC if A-B=(pi)/(2) , then C+2B is equal to

In ABC,(cot A)/(2)+(cot B)/(2)+(cot C)/(2) is equal to (Delta)/(r^(2))(b)((a+b+c)^(2))/(abc)2R(c)(Delta)/(r)(d)(Delta)/(Rr)

In a triangle ABC , acosB + b cosC + c cosA =(a+b+c)/2 then

If Z=(A^(4)B^(1/3))/(CD^(3/2)) ,than relative error in Z (Delta Z)/(Z) is equal to (a) ((Delta A)/(A))^(4)+((Delta B)/(B))^(1/3)-((Delta C)/(C))-((Delta D)/(D))^(3/2) (b) 4((Delta A)/(A))+((1)/(3))((Delta B)/(B))+((Delta C)/(C))+((3)/(2))((Delta D)/(D)) (c) 4((Delta A)/(A))+(1)/(3)((Delta B)/(B))-((Delta C)/(C))-((3)/(2))((Delta D)/(D)) (d) ((Delta A)/(A))^(4)+(1)/(3)((Delta B)/(B))+((Delta C)/(C))+(3)/(2)((Delta D)/(D))

In a triangle ABC, if 2b=a+c and A-C=90, then sin B equals

In a triangle ABC , (a^2-b^2-c^2) tan A +(a^2-b^2+c^2) tan B is equal to

In a triangle , if r_(1) = 2r_(2) = 3r_(3) , then a/b + b/c + c/a is equal to

If ' O ' is the circum centre of the A B C and R_1,\ R_2,\ R_3 are the radii of the circumcircle of triangle O B C ,\ O C A\ a n d\ O A B respectively then a/(R_1)+b/(R_2)+c/(R_3) has the value equal to (a b c)/(2R^3) (b) (R^3)/(a b c) (c) (4)/(R^2) (d) (a b c)/(R^3)

In a triangle ABC prove that a/(a+c)+b/(c+a)+c/(a+b)<2