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is cos(arccos(t)) = t ??

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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c_hockland
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c_hockland
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1 Solution
 
ozoCommented:
It could also be -t or t+2pi
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ozoCommented:
cos(arccos(t)) = t
arccos(cos(t)) = n*2*pi ± t
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c_hocklandAuthor Commented:
having said that ,

tan(arctan(t)) = t right ?

thanks Ozo.
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ozoCommented:
yes
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