1.

Write `cot^(-1)(1/(sqrt(x^2-1))),|x|>1`in the simplest form.

Answer» let` x=sectheta` then `theta=sec^(-1)x`
=`cot^(-1)(1/sqrt(sec^2theta-1))`
=`cot^(-1)(1/tantheta)`
=`cot^(-1)(cottheta)`
=`theta`
from (1)
=`sec^(-1)x`


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