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OpenStudy (s3a):
Could someone please help me find cos(theta) here?: http://f.imgtmp.com/Voqw6.jpg The answer is not: (-6*8 - 16*80)/(sqrt(6^2 + 16^2)*sqrt(8^2 + 80^2)) nor -(-6*8 - 16*80)/(sqrt(6^2 + 16^2)*sqrt(8^2 + 80^2)) Any help would be appreciated!
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