posted by Kate on .
Compute inverse functions to four significant digits.
cos^2x + 5cosx -3=0
now you have a quadratic, solve for cos x using the equation
cosx=(-5 -+ sqrt (25 +12)/2
the back of the book says .9987+2kpi and -.09987+2kpi
when i do it i don't get that answer.
I get it, that answer is in radians. The 2kpi is to keep rotation a number of times in the circle.
Thank you so much for helping me I have AC tomorrow and without your help i would have not been able to do that whole section.