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OpenStudy (anonymous):
solve for t: -pi/4 * sin(pi*t/4) = 0
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OpenStudy (anonymous):
-pi/4 * sin(pi*t/4) = 0 sin(pi*t/4) = 0 pi*t/4 = 0 or pi or 2pi or ...... t=0 or 4 or 8 or....
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