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OpenStudy (anonymous):
suppose that w=(1/r)*f(t-r/a) and that r=sqrt(x^2+y^2+z^2) show that w_xx + w_yy + w_zz = (1/a^2)*w_tt (w_xx, w_yy, w_zz, w_tt are all partial derivatives of w with respect to each variable)
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