Скачать или смотреть 34 determinant of adjoint of matrix | let A be a 3×3 real matrix with det(A)=6 Then det(adjA) is

let A be a 3×3 real matrix with det(A)=6.
Then det(adjA) is
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Q.21) let f(x,y)=(xy^2)/(x+y), if (x,y≠(0,0)@0, (x,y)=0
Then which of the followingis true for f at the
point (0,0)
f(x,y) continuous but not differentiable
f(x,y) is continuous & differentiable
f(x,y) is not continuous
f(x,y) is neither continuous nor differentiable


let f(x,y)={xy/(x^2+y^2)^α , (x,y)≠(0,0)
Then which of the followingis true for f at the
point (0,0)
For α=1,f(x,y) is continuous but not differentiable
For α=1/2,f(x,y) is continuous & differentiable
For α=1/4,f(x,y) is continuous & differentiable
For α=3/4,f(x,y) is neither continuous nor differentiable