SOLUTION:  If 0° ≤ x ≤ 90° and tan x=15/8, then cos x = ?
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Question 1103900:   If 0° ≤ x ≤ 90° and tan x=15/8, then cos x = ? 
Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
 
So,
and
So,
 
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