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greeneyes<3

  • 2 years ago

Evaluate without using a calculator. Answer in radians and degrees. Thank you! (:

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  1. greeneyes<3
    • 2 years ago
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    \[\sin^{-1} (-1)\]

  2. greeneyes<3
    • 2 years ago
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    my answer was 270 degrees, (3 pi/2) however i'm terrible in math so can someone please check my answer? xD thank you.

  3. kaisan
    • 2 years ago
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    \[\sin ^{-1}(-1)= \Pi or 180 degrees\]

  4. satellite73
    • 2 years ago
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    no it is not right unfortunately because your answer needs to be in the interval \([-\pi,\pi]\)

  5. phi
    • 2 years ago
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    Are you guys sure?? I always thought sin(-90)= -sin(90)= -1 and -90 is 270

  6. satellite73
    • 2 years ago
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    mistake on my part, should have been \[\sin(-\frac{\pi}{2})=-1\] and therefore \[\sin^{-1}(-1)=-\frac{\pi}{2}\]

  7. satellite73
    • 2 years ago
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    @phi i was wrong it should be -90, or \(-\frac{\pi}{2}\) not \(-\pi\)

  8. phi
    • 2 years ago
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    @satellite73 - I was getting worried when multiple people were saying pi. btw, the answer could be the interval 0 to 2pi or -pi to +pi , depending on who's asking the question. Personally, 270 and 3pi/2 would be ok with me.

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