SOLUTION: How do I find the solution to this problem using my TI-30xs? If cos of theta = 0.4, then find tan of theta.

Algebra ->  Trigonometry-basics -> SOLUTION: How do I find the solution to this problem using my TI-30xs? If cos of theta = 0.4, then find tan of theta.      Log On


   

Question 850147: How do I find the solution to this problem using my TI-30xs?
If cos of theta = 0.4, then find tan of theta.
Found 2 solutions by rothauserc, Edwin McCravy:
Answer by rothauserc(4718) About Me  (Show Source):
You can put this solution on YOUR website!
sec(x) = 1 / cos(x) = 1 / 0.4 = 2.5
tan^2(x) + 1 = sec^2(x)
tan^2(x) = sec^2(x) - 1 = 2.5^2 - 1 = 5.25
tan(x) = sqrt(5.25) = 2.29

Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
PRESS tan
PRESS 2nd
PRESS cos
PRESS 0.4
PRESS ))

you should see tan(cos-1(0.4))

PRESS ENTER

The answer is 2.291287847 

Edwin