Asked by clouds

Use your calculator to find cos−1(0.76) to the nearest degree.

A. 49°
B. 47°
C. 43°
D. 41°

please help me calculate this
Answered by oobleck
impatient much?
again? We did this for TAN. What's so hard about COS?
Answered by clouds
sorry. but when. I do COS it shows 0.99
Answered by oobleck
no way. You did not press the INV key before COS.
Answered by oobleck
you found cos(0.76°)
since cos(0) = 1, that explains the 0.999912027
Answered by clouds
my calculator doesn't have INV. It has IN which doesn't work either.
Answered by oobleck
looks like you need to read the user guide for you calculator. If it has a COS button, it will also have a button for alternate functions. You did this for TAN, right? somewhere there will be mention of inverse trig functions.
Answered by oobleck
on my calculator, above the COS button there is a small red cos<sup><sup>-1</sup></sup>
The INV key is also labeled above in red. Surely yours looks similar to this.
Answered by clouds
my calculator doesn't have a users guide. but I wen to google calculator and they have INV.
Answered by clouds
okay now I am putting 0.76 then INV then COS and its says Error.
Answered by oobleck
did you clear all previous results first?
Sure sounds like user error to me.
back to the user's guide.
Answered by clouds
yes I did I don't have a guide. it won't work
Answered by Taki
oobleck if you're not gonna help then why even respond.
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