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algebra2

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I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert.

  • algebra2 -

    Example, teachers answer to the following was
    sin 315deg = -sin 45deg = -sqrt2/2
    I got a decimal answer.

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