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D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

sin(15) = 150/x / - 150/x

sin(15)-(150/x) = 0

sin(15)-150*x^-1 = 0

-150*x^-1 = -sin(15) / : -150

x^-1 = sin(15)/150

-1 < 0

1/(x^1) = sin(15)/150 / * x^1

1 = (sin(15)/150)*x^1 / : sin(15)/150

150*(sin(15))^-1 = x^1

x = 150*(sin(15))^-1

x = 150*(sin(15))^-1

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