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.

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) (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) (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

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