How to do cos-1 on ti-collège plus
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wradja
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Hello, I want to find an angle but I can't figure out how to do cos⁻¹ :
cos DBC = BC over DB
cos DBC = 2.4 over 7.4
How do I find the answer in degrees for an angle?? I can't find cos⁻¹ on the calculator!! Thank you
Wendy.
cos DBC = BC over DB
cos DBC = 2.4 over 7.4
How do I find the answer in degrees for an angle?? I can't find cos⁻¹ on the calculator!! Thank you
Wendy.
1 réponse
Hello,
Normally, there's a yellow button at the top left labeled "2nd."
By pressing it, the next button you press will correspond to what is written just above that button (also in yellow).
In your case, above the "cos" button, in yellow, you should find either "arccos" or "cos-1." I assume it's arccos; otherwise, you wouldn't have asked the question.
Arccos corresponds to cos-1. So you do arccos(2.4/7.4) to find the angle DBC.
--
Brittany... the most beautiful place in the world.
Normally, there's a yellow button at the top left labeled "2nd."
By pressing it, the next button you press will correspond to what is written just above that button (also in yellow).
In your case, above the "cos" button, in yellow, you should find either "arccos" or "cos-1." I assume it's arccos; otherwise, you wouldn't have asked the question.
Arccos corresponds to cos-1. So you do arccos(2.4/7.4) to find the angle DBC.
--
Brittany... the most beautiful place in the world.
Have a nice day :)