M~m-M-|||-k1 k2-|||-(B) =(x)_(0)cos [ sqrt (dfrac {{k)_(1)(k)_(2)}(m({k)_(1)+(k)_(2))}}] 0 x0 x-|||-(C) =(x)_(0)cos [ sqrt (dfrac {{k)_(1)+(k)_(2)}(m)}t+pi ] .-|||-(D) =(x)_(0)cos [ sqrt (dfrac {{k)_(1)(k)_(2)}(m({k)_(1)+(k)_(2))}}t+pi ] (E) =(x)_(0)cos [ sqrt (dfrac {m)({k)_(1)+(k)_(2)}}]

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