Do you mean and , or and ?
Ok well first the minus 1 exponent in the outer brackets tells you to take the inverse of the fraction. i.e:
next, you can cancel the square root on the denominator, and the numerator exponent becomes 3/2, since the square root can be replaced by the exponent, 1/2, and we know as a rule of indicies, ....
Next step is to use this rule again on the numerator: