A section of a graph of a function f :R2 ?R is obtained by intersecting the graph with vertical planes e.g. setting x = 0 produces the section z = f(0
from cylindrical to rectangular coordinates. Solution: ·. Graphing in Cylindrical Coordinates. Cylindrical coordinates are good for graphing surfaces of
Cartesian. Cylindrical. Spherical. Cylindrical Coordinates x = r cos? r = ?x2 + y2 y = r sin? tan ? = y/x z = z z = z. Spherical Coordinates x = ?sin?cos?.
Use those values to graph the path (r(t) ?(t)
and (for spherical coordinates) ?2 sin2 ? = 2?sin?cos? or simply ?sin? = 2 cos?. Example (5) : Describe the graph r = 4 cos? in cylindrical coordinates.
To convert from rectangular to cylindrical coordinates (or vice versa) use the From the preceding section
https://victoriakala.files.wordpress.com/2019/04/math6a-s16-examples.pdf
26 ian. 2017 Here's the same data relating cartesian and spherical coordinates: ... can also be seen from our graph: projecting D into the xy-plane gives ...
Since (¡1¡1) is in the third quadrant
To see this we sketch the polar equation r = cos? by “plotting points”. It's a bit easier to also sketch the graph of r = cos? in the r?-coordinate system