SOLUTION: If
cos
y
=
7
9
cosy=
​9
​
​7
​​ , then what is the positive value of
cos
1
2
y
cos
​2
​
​1
​​ y, in
Algebra ->
Trigonometry-basics
-> SOLUTION: If
cos
y
=
7
9
cosy=
​9
​
​7
​​ , then what is the positive value of
cos
1
2
y
cos
​2
​
​1
​​ y, in
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Question 1111937: If
cos
y
=
7
9
cosy=
9
7
, then what is the positive value of
cos
1
2
y
cos
2
1
y, in simplest radical form with a rational denominator? Answer by Alan3354(69443) (Show Source):
