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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
sin(12) = 50/y // - 50/y
sin(12)-(50/y) = 0
sin(12)-50*y^-1 = 0
-50*y^-1 = -sin(12) // : -50
y^-1 = sin(12)/50
-1 < 0
1/(y^1) = sin(12)/50 // * y^1
1 = (sin(12)/50)*y^1 // : sin(12)/50
50*(sin(12))^-1 = y^1
y = 50*(sin(12))^-1
y = 50*(sin(12))^-1
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