Question

State the domain for which the inverse function is decreasing.

Don't really understand this question...

Answer 1

inverse function of y=cosx (which is y=cos^-1(x))

Answer 2

if you look at the unit circle

cosine decreases continuously from zero to π

Answer 3

take a look at the graph. it increases on [-1,1] but you need to restrict the domain of cos(x) to [-π,0] or [π,2π], etc.

Answer 4

oops. my bad. I read "increasing"