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is cos(arccos(t))  = t ??

Posted on 2007-03-17
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i working on some partial derivatives and ran into

cos(arccos(t))

is it equal to t ?

also is it correct to say arccos(cos(t)) = t ??

any ideas?
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Question by:c_hockland
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4 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 18741895
It could also be -t or t+2pi
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LVL 84

Expert Comment

by:ozo
ID: 18741905
cos(arccos(t)) = t
arccos(cos(t)) = n*2*pi ± t
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Author Comment

by:c_hockland
ID: 18741910
having said that ,

tan(arctan(t)) = t right ?

thanks Ozo.
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ozo earned 2000 total points
ID: 18741935
yes
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