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OpenStudy (anonymous):
Verify the identity. (7 points) cos(x+pi/2) = -sin x
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OpenStudy (solomonzelman):
use the following rule: \(\large\color{slate}{\cos(a+b)=\cos(a)\cos(b)-\sin(a)\sin(b) }\)
OpenStudy (anonymous):
@SolomonZelman so can you help me
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