Question

if cos feta=-3/5 and pi 15 years ago

Answer 1

theta

Answer 2

okok but how do i do this?

Answer 3

What do you usually work with: degrees, radians?

Answer 4

radians

Answer 5

Well this is not from a special angle, and would not be on the trig circle, so you just punch it in your calculator.

Answer 6

\[\cos \theta =-3/5\]Therefore, the angle theta whose cos is -3/5, stated differently\[\theta =\cos^{-1} (-3/5)\]

Answer 7

that is the cosine inverse

Answer 8

Take the inverse of \[\cos \Theta \] and divide it by 2, and you will have \[\Theta/2\]