document.write( "Question 1079467: cosine s = 12/13
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Algebra.Com's Answer #693746 by Alan3354(69443)\"\" \"About 
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cosine s = 12/13
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\n" ); document.write( "Use sin^2 + cos^2 = 1 to find sin(s) and cos(t)
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\n" ); document.write( "Then, sin(s+t) = sin(s)*cos(t) + sin(t)*cos(s)
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