Find the value of `( (x^-2 times y^-4 )/ ( x^-3 times y^-1)`÷ `y^-2/x^-1 )`

Find the value of : ( x / y )^x times ( y/x )^y , x = 4 , y = -7

Find the value of ( 1/x + 1/y ) ( 1/x - 1/y ) ( 1/x^2 + 1/y^2 )

(6x^(2)times9y^(-3))/((2x)^(-4)times(3y)^(2))

Evaluate : 1/2 x^2y^2 times ( -1/4x^3y^3 ) times ( x^3y^3) times x^2y^2

Evaluate : 1/2 x^2y^2 times ( -1/4x^3y^3 ) times ( x^3y^3) times x^2y^2

Evaluate : x^2 times ( x/y - y/x ) times ( y/x + x/y ) times y^2

Evaluate : sqrt ( x^5 / y^2 ) times sqrt ( x^6 / ( x^-2 y^-4 ) )

Evaluate : sqrt ( x^5 / y^2 ) times sqrt ( x^6 / ( x^-2 y^-4 ) )

Evaluate : y times y times y times y times x

Find the value of (( x -y )^3 + ( y - z )^3 + ( z - x )^3 )/ (9 ( x - y )( y - z ) ( z - x )) 1 . 0 2 . 1/9 3 . 1/3 4. 1