SOLUTION: DOUBLE ANGLE IDENTITIES 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 solu

Algebra ->  Test -> SOLUTION: DOUBLE ANGLE IDENTITIES 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 solu      Log On


   

Question 1189939: DOUBLE ANGLE IDENTITIES
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)
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Answer by Alan3354(69443) About Me  (Show Source):
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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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cos%28a%29+=+sqrt%281+-+sin%5E2%28a%29%29
cos(a) = -5/13 (negative in Q3)
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tan = sin/cos = 12/5 (positive in Q3)
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No double angles involved.