book Maths Puzzle Numerical Ability

Find the exponential form of - 1 - i.

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book Other Question

How do you perform this operation to its simplest form:
1/x2y.2/xy.3/xy2
The first and the last "2" are exponents
Thanks If a and b are distinct real numbers such that a-b and a^2 -b^2 are rational, must a and b be rational?