Take the 2-minute tour ×
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

Please help. I need a guide for this homework question.

Let $u_1 = (x+y)/2$ and $u_2 = (x-y)/2$, where $x$ and $y$ are Cartesian coordinates. Write the differential $d \vec{r}$ as a linear combination of $\hat{e}_1$ and $\hat{e}_2$, and determine the element $ds$ (or $ds/dt$) of arclength.

Thanks in advance

share|improve this question
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.