If in a triangle `ABC /_B=60^@,` then (A) `(a-b)^2=c^2-ab` (B) `(b-c)^2=a^2-bc` (C) `(c-a)^2=b^2-ac` (D) `a^2+b^2+c^2=2b^2+ac^2`

In a triangle ABC, 2B= A + C and b^(2) = ac , then (a(a+b+c))/(3bc) is

In a triangle ABC, 2B= A + C and b^(2) = ac , then (a(a+b+c))/(3bc) is

In triangle ABC , prove that 2(bc cos A +ac cos B +ab cos C)=a^2+b&2+c^2 .

If, in a Delta ABC, c^(2) + a^(2) - b^(2) = ac , then : /_B =

In a Delta ABC,2ac sin((A-B+C)/(2)) is equal to (a)a^(2)+b^(2)-c^(2)(b)c^(2)+a^(2)-b^(2)(c)b^(2)-c^(2)-a^(2)(d)c^(2)-a^(2)-b^(2)

If D is the mid-point of the side BC of triangle ABC and AD is perpendicular to AC, then 3b^(2)=a^(2)-c( b )3a^(2)=b^(2)3c^(2)b^(2)=a^(2)-c^(2)(d)a^(2)+b^(2)=5c^(2)

Prove that: |-a^2 ab ac ba -b^2 bc ac bc c^2| =4a^2b^2c^2 .

Prove that |((b+c)^2,ab,ca),(ab,(a+c)^2,bc),(ac,bc,(a+b)^2)|=2abc(a+b+c)^3

(a+b+c)(a^(2)+b^(2)+c^(2)-ab-bc-ac)