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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(53) = 75/x // - 75/x
sin(53)-(75/x) = 0
sin(53)-75*x^-1 = 0
-75*x^-1 = -sin(53) // : -75
x^-1 = sin(53)/75
-1 < 0
1/(x^1) = sin(53)/75 // * x^1
1 = (sin(53)/75)*x^1 // : sin(53)/75
75*(sin(53))^-1 = x^1
x = 75*(sin(53))^-1
x = 75*(sin(53))^-1
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