document.write( "Question 1189939: DOUBLE ANGLE IDENTITIES
\n" ); document.write( "1. Use the double angle identities to find the exact value of sine, cosine, tangent function if sinA = -(12/13) and A lies in Quadrant III. (Show full solution)\r
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Algebra.Com's Answer #821504 by Alan3354(69443)\"\" \"About 
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Use the double angle identities to find the exact value of sine, cosine, tangent function if sinA = -(12/13) and A lies in Quadrant III
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\n" ); document.write( "\"cos%28a%29+=+sqrt%281+-+sin%5E2%28a%29%29\"
\n" ); document.write( "cos(a) = -5/13 (negative in Q3)
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\n" ); document.write( "tan = sin/cos = 12/5 (positive in Q3)
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\n" ); document.write( "No double angles involved.\r
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