limit as x approaches 0 of (9sin(x))/x

解答

x \to 0 lim (\frac{9 sin ( x )}{x})

9

求解步骤

x \to 0 lim (\frac{9 sin ( x )}{x})

x \to a lim [c \cdot f (x)] = c \cdot x \to a lim f (x)

= 9 \cdot x \to 0 lim (\frac{sin ( x )}{x})

使用洛必达法则

= 9 \cdot x \to 0 lim (\frac{cos ( x )}{1})

代入值

x = 0

= 9 \cdot \frac{cos ( 0 )}{1}

化简

9 \cdot \frac{cos ( 0 )}{1} : 9

= 9

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