<PRE><B>Question 1189939</B>
 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(a) = sqrt(1 - sin^2(a))}}}
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.


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