Math Help - Trig help

1. Trig help

I have a bunch of questions that I thought I knew how to do and i cant get the right answers with my calculator. i have a ti-89.

The first question is " find the acute angel theta given cos(theta)=.3842"

the other question is how do i find "five other trigonometric function values given cos(theta)=.7"

Thank you very much

2. Please do not double post ..

(1) $cos\theta=0.3842$

$cos^{-1}0.3842=....$

(2) Given that $cos\theta=0.7$ , the 5 other trigo function are sin , tan , cot, cosec,and sec .

Just draw a triangle ..

For question 1 work out: $cos^{-1}0.3842=\theta$