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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
225 = (120^2)/s // - (120^2)/s
225-((120^2)/s) = 0
-14400*s^-1 = -225 // : -14400
s^-1 = 1/64
-1 < 0
1/(s^1) = 1/64 // * s^1
1 = 1/64*s^1 // : 1/64
64 = s^1
s = 64
s = 64
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