Can somebody show me how to finish this one off? I know that the answer is and , but I don't know how to lay this out. Here is what I have:

Not sure how to solve this algebraically.

Thanks.

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- Jan 13th 2011, 03:20 PMreastlandInequality
Can somebody show me how to finish this one off? I know that the answer is and , but I don't know how to lay this out. Here is what I have:

Not sure how to solve this algebraically.

Thanks. - Jan 13th 2011, 03:27 PMdwsmith
Think about solving this

Now, if we restrict the solutions to the unit circle, we have

Now, test point to the left and right of those numbers. - Jan 13th 2011, 03:37 PMpickslides