" If "(a+b+c)(b+c-a)=3bc," find "A

If(a + b + c)(b + c-a) = 3bc in /_\ABC , prove that A = 60^@

If (a+b+c) (b+c-a) = 3bc then find angle A .

In DeltaABC, if (a+b+c)(b+c-a)=3bc , then A=

Prove that if (a + b+ c)(b + c - a) = 3bc then A = 60^@

If (a+b+c)(b+c-a)=3bc then show that angleA=pi/3

underset then In ABC, if (a+b+c)(b+c-a)=3bc

If (a-2b-3c+4d)(a+2b+3c+4d) = (a+2b-3c-4d)(a-2b+3c-4d) then 2ad = "(a) 3bc (b) bc (c) 5bc (d) 2bc"

(i) If a^(2)+b^(2)+c^(2)=20 " and" a+b+c=0, " find " ab+bc+ac . (ii) If a^(2)+b^(2)+c^(2)=250 " and" ab+bc+ca=3, " find" a+b+c . (iii) If a+b+c=11 and ab+bc+ca=25, then find the value of a^(3)+b^(3)+c^(3)-3 abc.

(i) If a^(2)+b^(2)+c^(2)=20 " and" a+b+c=0, " find " ab+bc+ac . (ii) If a^(2)+b^(2)+c^(2)=250 " and" ab+bc+ca=3, " find" a+b+c . (iii) If a+b+c=11 and ab+bc+ca=25, then find the value of a^(3)+b^(3)+c^(3)-3 abc.

If a = 2, b = 3 and c = -2, find the value of a^(2)+b^(2)+c^(2)-2b-2bc-2ca+3abc