### Home > CALC > Chapter 7 > Lesson 7.4.4 > Problem 7-212

7-212.

A particle moves along the curve * *so that its

*-coordinate increases at the constant rate of*

*changing when*

*?*

(As shown in the diagram, * *is the angle between the segment joining the point to the origin and the

*-axis.)*

What are the opposite and adjacent sides here?

To obtain , since the

*-coordinate and*