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HomertheGenius
If sin β = 0.45, we have to find cos ( π/2 - β ).
We know that: sin x = cos ( 90° - x ), or sin x = cos ( π/2 - x ). 
For example:  sin 60° = cos 30°.
cos ( π/2 - β ) = sin β = 0.45
Answer: 0.45

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