Question

Which is equivalent to cos-1(0.17)? Round your answer to the nearest hundredth of a radian.

Answer 1

Let
cos A------> 0.17
then
A=arc cos (0.17)------> A=80.212°

convert degrees to radians
pi radians is equal to-----------> 180°
x-------------------------> 80.212°
x=80.212*pi/180-----> x=1.40 radians

the answer is
1.40 radians