Question

evaluate cos^-1 (0)

Answer 1

you know a number whose cosine is zero?

Answer 2

yes

Answer 3

what is it?

Answer 4

oh no sorry just evaluate that equation in terms of pi or sqrt, is what it is asking

Answer 5

let me ask again
do you know a number whose cosine is zero? i.e. what is \(\theta\) if \(\cos(\theta)=0\) ?

Answer 6

1?

Answer 7

hmm no

Answer 8

it is true that \(\cos(0)=1\) but that is not the question
what number would you put IN to get OUT zero

Answer 9

90

Answer 10

yes, except i think you are working with numbers (radians) not degrees, so it is \(\frac{\pi}{2}\)

Answer 11

so since
\[\cos(\frac{\pi}{2})=0\] you have
\[\cos^{-1}(0)=\frac{\pi}{2}\]