# Trig help

• January 19th 2009, 06:44 PM
MOnroeMAth
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
• January 19th 2009, 07:03 PM
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 ..
• January 20th 2009, 09:41 AM
FreeT
For question 1 work out: $cos^{-1}0.3842=\theta$