Tax rates are 10% on the first $10,000 you earn and 20% on amounts over that. You earn $15,000. What is your tax?
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It's difficult to make out, but I think the task is to expand
Write the number in polar form first:
By DeMoivre's theorem, you have
and converting back to Cartesian form, this number is equivalent to
Write the number in polar form first:
By DeMoivre's theorem, you have
and converting back to Cartesian form, this number is equivalent to