Asked by Cody
cos2x=secx find x
Answers
Answered by
Steve
cos2x = secx
2cos^2(x)-1 = 1/cosx
2cos^3(x) - cosx - 1 = 0
you will probably need to use a graphical or numeric method to solve this.
However, you know that cos2x never gets more than 1, and secx never gets less than 1.
So, you will need
cos2x = secx = 1
or
cos2x = secx = -1
Try that on for size
2cos^2(x)-1 = 1/cosx
2cos^3(x) - cosx - 1 = 0
you will probably need to use a graphical or numeric method to solve this.
However, you know that cos2x never gets more than 1, and secx never gets less than 1.
So, you will need
cos2x = secx = 1
or
cos2x = secx = -1
Try that on for size
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