# I need help in trigonometry :S

1. Oct 14, 2008

### Jerina

i got to find the sin and cos of cylinder. in the cylinder system plz help me

2. Oct 14, 2008

### nkks

your question is not clear jerina.

3. Oct 14, 2008

### Jerina

i got to find the Cylindrical coordinates :s sorry

4. Oct 14, 2008

### nkks

I'm sorry,I think it deals with higher mathematical trigonometry.I know few about sin & cos but like sinx & cosx and there calculation like how to find the reasonable range of x ;in sinx+cosx=sin2x

5. Oct 14, 2008

### Staff: Mentor

I'm guessing that you need to find the cylindrical coordinates for a cylinder, but you haven't told us anything about the cylinder you're working with. A point in cylindrical coordinates is an ordered triple of numbers, (r, $$\vartheta$$, z).

For a vertical cylinder of radius a whose center axis lies along the z-axis, the equation is very simple: r = a. Every point (r, $$\vartheta$$, z) on this cylinder will have an r value of a.

6. Oct 14, 2008

### Jerina

http://faculty.eicc.edu/bwood/ma220supplemental/sup7fig1.gif [Broken] like that or that http://einstein1.byu.edu/~masong/emsite/S1Q80/vectorgeometry.gif

Last edited by a moderator: May 3, 2017
7. Oct 14, 2008

### Staff: Mentor

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Like the first one. The second one shows spherical coordinates.

Last edited by a moderator: May 3, 2017
8. Oct 14, 2008

### jacobrhcp

you should show some sincere work before you ask anyone for help.