cosine anyone? if cos(54°) = 0.5878, then arccos(0.15878) =?

[trig]

cosine anyone? if cos(54°) = 0.5878, then arccos(0.15878) =?

If cos 54 deg =0.5878 then cos-1 0.15878 is equal to?

Anyone?

 

[Denis]

I sure don't understand what you're asking...perhaps someone else will...

 

[soroban]

Re: cosine anyone? if cos(54°) = 0.5878, then arccos(0.15878

Hello, trig!

Did I interpret this correctly?

\(\displaystyle \text{If }\,\cos54^o\:=\:0.5878\;\;\text{find }\cos^{^{-1}}(0.15878)\)

We have: \(\displaystyle \,\cos\theta \,=\,x\) . . . and we must find: \(\displaystyle \,\cos^{^{-1}}\left(\frac{x\,+\,1}{10}\right)\)

Good luck!
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