Please answer the question

6. (C) A string has its endpoints fixed at (0, 0) and (L, 0). If its height at x and time f is o(x, t) then (to a good approximation) its total kinetic energy is E(d) = 2 for older and its total potential energy (coming from stretching tension) is T() = ; foodx. The string moves to minimise the integral (E($) - T($))dt. Could you explain why calculating Show that the string obeys the wave equation the integral of E(phi) (integral x from 1 020 26 0 to L) then there is no L and x? C2 at2 where c = VT/P