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12-85.

Rewrite each of the following expressions in a simpler form.

  1. Remember:
    .
    The variable here is different, but will this change the identity? If you aren't sure, let

  1. Remember:
    .

  1. Try writing  as opposite over hypotenuse and  as adjacent over hypotenuse. Simplify the complex fraction. Is the new ratio equivalent to another trig ratio?