[t] Corrected acot() tests in trans-infan.t
[t] Corrected acot() tests in trans-infan.t

The previously commented-out tests were not testing for the correct values.
The test results used here have been checked against expected values from
Mathematica.

parrot/parrot,tkob/parrot,FROGGS/parrot,tkob/parrot,tkob/parrot,parrot/parrot,youprofit/parrot,tkob/parrot,youprofit/parrot,parrot/parrot,tkob/parrot,FROGGS/parrot,youprofit/parrot,FROGGS/parrot,FROGGS/parrot,tkob/parrot,youprofit/parrot,FROGGS/parrot,FROGGS/parrot,FROGGS/parrot,youprofit/parrot,youprofit/parrot,parrot/parrot,youprofit/parrot,youprofit/parrot,parrot/parrot,tkob/parrot,FROGGS/parrot,tkob/parrot