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cos(x/2)/x

Limit of the function cos(x/2)/x

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The solution

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     /   /x\\
     |cos|-||
     |   \2/|
 lim |------|
x->0+\  x   /
$$\lim_{x \to 0^+}\left(\frac{\cos{\left(\frac{x}{2} \right)}}{x}\right)$$
Limit(cos(x/2)/x, x, 0)
Lopital's rule
There is no sense to apply Lopital's rule to this function since there is no indeterminateness of 0/0 or oo/oo type
The graph
Rapid solution [src]
oo
$$\infty$$
Other limits x→0, -oo, +oo, 1
$$\lim_{x \to 0^-}\left(\frac{\cos{\left(\frac{x}{2} \right)}}{x}\right) = \infty$$
More at x→0 from the left
$$\lim_{x \to 0^+}\left(\frac{\cos{\left(\frac{x}{2} \right)}}{x}\right) = \infty$$
$$\lim_{x \to \infty}\left(\frac{\cos{\left(\frac{x}{2} \right)}}{x}\right) = 0$$
More at x→oo
$$\lim_{x \to 1^-}\left(\frac{\cos{\left(\frac{x}{2} \right)}}{x}\right) = \cos{\left(\frac{1}{2} \right)}$$
More at x→1 from the left
$$\lim_{x \to 1^+}\left(\frac{\cos{\left(\frac{x}{2} \right)}}{x}\right) = \cos{\left(\frac{1}{2} \right)}$$
More at x→1 from the right
$$\lim_{x \to -\infty}\left(\frac{\cos{\left(\frac{x}{2} \right)}}{x}\right) = 0$$
More at x→-oo
One‐sided limits [src]
     /   /x\\
     |cos|-||
     |   \2/|
 lim |------|
x->0+\  x   /
$$\lim_{x \to 0^+}\left(\frac{\cos{\left(\frac{x}{2} \right)}}{x}\right)$$
oo
$$\infty$$
= 150.999172186187
     /   /x\\
     |cos|-||
     |   \2/|
 lim |------|
x->0-\  x   /
$$\lim_{x \to 0^-}\left(\frac{\cos{\left(\frac{x}{2} \right)}}{x}\right)$$
-oo
$$-\infty$$
= -150.999172186187
= -150.999172186187
Numerical answer [src]
150.999172186187
150.999172186187
The graph
Limit of the function cos(x/2)/x