" 35.Find "y''" if "x^(4)+y^(4)=16" ."

(a) If y=cos(msin^(-1)x) prove that (1-x^(2))y_(3)-3xy_(2)+(m^(2)-1)y_(1)=0 (b) Find y'' if x^(4)+y^(4)=16 .

Factorise 81 x ^(4) - 16y^(4)

Factorise : 16x^(4)-y^(4)

Factorise 16x^(4)-81y^(4) .

Factorise 16x^(4)-81y^(4) .

If x^(3) + y^(3) = 16 and x + y = 4 , then the value of x^(4) + y^(4) is :

If 3x + 4y= 16 and xy= 4 , find the value of 9x^(2) + 16y^(2)

Find the centre and radius of the circle 4x^(2) + 4y^(2) + 16y -4x = 19.