How would one find the way to put arccot(x) into the calculator. on the internet i was able to determine that there is a piecewise form and also a more simple form of

i don't see how either was gotten reallyother than the piecewise part for positive xs being arctan(1/x) which can be found similarly to how arcsec and arccsc are found.

At which value in the domain does f(x) =0?

Which expression converts 45 degree to radians

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.