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Math Help - Finding inverse sine, cosine and tangent without calculator.

  1. #1
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    Finding inverse sine, cosine and tangent without calculator.

    Hi guys...I have a math test tomorrow and one of the sections involves finding inverse sine operations without using a calculator.

    For example Sin-1(2)

    Now I know how to find regular sine using the unit circle but how do you do inverse without a calculator?

    Thanks to anyone who can help.
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  2. #2
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    Consider this relationship

    \sin \left(\frac{\pi}{4}\right) = \frac{1}{\sqrt{2}}

    Do you know how this was solved?

    Therefore

    \frac{\pi}{4} =\sin^{-1} \left( \frac{1}{\sqrt{2}}\right)
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  3. #3
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    ^Thank you...you just boosted my grade from an f to a passing grade.

    On an unrelated note do you play guitar? Pickslides sounds like a guitar thing...you know picks and slides.
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  4. #4
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    Quote Originally Posted by goonodeath View Post

    On an unrelated note do you play guitar?
    Yep, loves it.
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