Answers

2014-02-17T21:11:01+08:00
I'll use x so it's easier to type

cos x = x/r 
so x=3 and r =5

y =  \sqrt{r^2 -x^2}
y = \sqrt{5^2 -3^2}
y = 4

tan x = y/x
tan x = 4/3
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