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The exact value is
.
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To find the exact value of
, we can use the double angle identity for sine:
Let
. This means that
.
Next, we need to find
. Using the Pythagorean identity:
we can rearrange this to find
:
Calculating
:
Thus,
Now, taking the square root,
Now we have both
and
:
Now we can apply the double angle formula:
Calculating this gives:
Thus, the exact value is: