5) If Cos o
11/15
then find Sin O.
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Apply formula sin ^2 teta + cos ^2 teta = 1
11 ^2
____ × cos ^2 teta = 1
15^2
121
___ + cos ^2 teta = 1
225
cos ^2 teta = 1 - 121
___
225
cos ^2 teta = 104
___
225
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