If in `triangleABC ,a^4+b^4+c^4=2c^2(a^2+b^2)` then find `angleC`

If in triangleABC ,3a^2=b^2+c^2 then cotB+cotC-cotA=

If a, b, c are the sides of the triangle ABC such that a^(4) +b^(4) +c^(4)=2x^(2) (a^(2)+b^(2)), then the angle opposite to the side c is-

If a^4+b^4+c^4+a^2b^2=2c^2(a^2+b^2) ,, then show that angleC=60^@or120^@

In triangleABC if c^2=a^2+b^2 then 4s(s-a)(s-b)(s-c)=

(i) If in a triangle ABC, a^(4) + b^(4) +c^(4) - 2b^(2) c^(2) -2c^(2)a^(2)=0 , then show that, C=45^(@) or 135^(@) . (ii) In in a triangle ABC, sin^(4)A + sin^(4)B + sin^(4)C = sin^(2)B sin^(2)C + 2sin^(2) C sin^(2)A + 2sin^(2)A sin^(2)B , show that, one of the angles of the triangle is 30^(@) or 150^(@)

In triangle ABC if a^(4) + b^(4) + c^(4) = 2a^(2)b^(2) + 2b^(2)c^(2) then the values of B will be-

In triangleABC sin^2A+sin^2B =sin^2C then angleC=

In triangleABC,sin((B+C)/2) =

If in triangleABC ,a=5cm b= 5sqrt3 and angleC=30^@ then c=

If in triangle ABC,cot(A/2)=(b+c)/a, then the triangleABC is