Tangent plane with three variables
30246
Find the equation of the tangent plane to the surface $x^{\frac{2}{3}}+y^{\frac{2}{3}}+z^{\frac{2}{3}}=2^{\frac{2}{3}}$ at $(x_0,y_0,z_0)$
39159
Finding unit tangent, normal, and binormal vectors for a given r(t)
116656
how do I 3D Plot f(x,y,z)=0
76001
Construct a fourth circle tangent to 3 circles forming a tangency chain
15596
Identification of each tangent space $T_pV$ with $V$ itself?
151981
Tangent line of a convex function
146308
Solving 2-degree equations in 3 variables.
95538
Polynomial passing through two points with specific tangents
16717
Possibly rotated parabola from three points
10686
Finding the equation of more than one tangent line
114623
Finding the tangent to a piecewise function
101434
To find tangents to given circle from a point outside it
118723
Finding the tangents common to two rotated ellipses?
128721
Finding the equation of an ellipse tangent to two lines
77134
Proving a three variables inequality
46469
$n$ Lines in the Plane
71861
Circles and tangents and circumcircles