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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
sin(15) = 150/s // - 150/s
sin(15)-(150/s) = 0
sin(15)-150*s^-1 = 0
-150*s^-1 = -sin(15) // : -150
s^-1 = sin(15)/150
-1 < 0
1/(s^1) = sin(15)/150 // * s^1
1 = (sin(15)/150)*s^1 // : sin(15)/150
150*(sin(15))^-1 = s^1
s = 150*(sin(15))^-1
s = 150*(sin(15))^-1
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