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dv=dcost=-sintdt du=d(e^t)=e^tdt dz=d((u^2)v)=(u^2)dv+vd(u^2)=(u^2)dv+2uvdu =u^2(-sint)dt+2uve^tdt =-e^(2t)sintdt+2e^(2t)costdt =e^(2t)(cost-sint)dt dz/dt=e^(2t)*(cost-sint)
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