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I'm being asked to find the half angle of cos 5pi/8. I got an answer and have checked a few sources, which had the same answer. However, the program I am using keeps telling me that I am wrong

Step 1 - calculate the angle of impact in degrees of a stain where the width is 7mm and the length is 9.9 mm Step 2 - Determine the height of origin in inches using the tangent equation...

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