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OpenStudy (anonymous):
If sin(x) = B, then sin(x + π) =
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jimthompson5910 (jim_thompson5910):
use the identity sin(P+Q) = sin(P)*cos(Q) + cos(P)*sin(Q)
OpenStudy (er.mohd.amir):
pi+x lies in third quadrant so sin(pi+x)=-sin x only tan is +ve in III quadrant
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