does $x^{ \frac{1}{3} }$ have a tangent line at x=0?
8986
How can a "proper" function have a vertical slope?
121084
Right triangles and tangent lines
96554
Why is $x^0 = 1$ except when $x = 0$?
132124
$\int_{0}^{\infty}\frac{x}{x^3+1}dx$ =?
94193
determine whether $f(x, y) = \frac{xy^3}{x^2 + y^4}$ is differentiable at $(0, 0)$.
130322
Show that $f(x) = 0$ if $x = 0$ $f(x) = \text{exp}(-1/x^{2})$ if $x \neq 0$ is infinitely differentiable but not analytic at $x_{0} = 0$ `
7158
Using implicit differentiation to find a line that is tangent to a curve at a point
91278
The limit for $x\to 0$ of $x^3\sin (x)$ exists
138544
For which values of $x$, will $f (x) . f '(x) < 0$?
112898
Derivative of sin(x)/x at $0$ by definition of derivative
71128
Is the tangent function (like in trig) and tangent lines the same?
72906
Is $\frac{\partial}{\partial x_1}=\frac{\partial}{\partial y_1}$ if $x_1=y_1$?
63943
Is $\tan(\pi/2)$ undefined or infinity?
70086
Limit without l'Hopital or Taylor series: $\lim\limits_{x \to 0} \frac{x\cos x- \sin x}{x^3}$
55197
Roots of $ x^3-3x+1$
84436
third derivative of inverse function
115737
Tangent and Normal lines that pass through the origin