SOLUTION: if sec=5/9, find cos.

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Question 63185: if sec=5/9, find cos.
Found 2 solutions by joyofmath, Earlsdon:
Answer by joyofmath(189) About Me  (Show Source):
You can put this solution on YOUR website!
if sec=5/9, find cos.
If sec(x)=5/9 then cos%28x%29=1%2Fsec%28x%29=1%2F%285%2F9%29+=+9%2F5.

Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Since the cos and sec are inverses of each other (sec = 1/cos), then if sec = 5/9, cos = 9/5